A timeline of events before and during "Who Says You Can't Go Home Again?" Read only after being caught up to Chapter 12 of the main story.

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Cosa Nostra Era

1820: January 1st – Giotto Vongola is born in Sicily, Italy.

1834: Giotto's younger brother Ricardo is born.

1835: Cozarto Simon, G, and Giotto first meet and quickly become good friends.

1841: Founding of the Vongola: Sepira gifts Giotto seven rings that would later be known as the Vongola Rings. The Vongola, Simon, and Giglio Nero Families are formally established as protectors of the Tri-Ni-Set and benign vigilantes for the local Italian communities.

1848: The Ghost War: The Vongola, Simon, and Giglio Nero Families go to war against the ruling House of Bourbon and other opponents occupying Sicily. Elena Spade is killed during the war. Daemon Spade and Giotto become estranged with one another after the conflict, though Daemon remains as Giotto's Mist Guardian to uphold Elena's dying wishes.

1860: Daemon orchestrates a conspiracy to kill Cozarto in order to cripple the Simon Family and to compel them to submit as underlings to the Vongola. Giotto catches on to the conspiracy and prevents Cozarto's death. Jaded and weary of the constant fighting throughout the years, Cozarto decides to retire and leads the remnants of the Simon Family into hiding to live a more peaceful life. His survival is kept a secret from Daemon as Giotto requires his Guardian's assistance in further coming wars.

1861: Mafioso-Camorra Clan Wars: Together, the Vongola and Giglio Nero Families fight over territory and authority across Italy against the criminal Camorra clans. While the Camorra are defeated, the Vongola's ferocious and bloody victories inspire some to fear the Vongola Family's iron fist rather than to welcome their protection with gratitude.

1862: Giotto steps down from the position of Boss of the Vongola Family. Ricardo Vongola at age 28 formally becomes the Vongola Secondo. When Daemon joins Ricardo as his Mist Guardian, Giotto asks Alaude to establish CEDEF to help check the powers and expansion of the main Vongola branch. Inspired by Ugetsu Asari's and Cozarto's suggestions, Giotto retires to Japan.

1868: Under his new name of Ieyasu Sawada, Giotto has a son named Yoshimune.

Vongola Crime Era

1869: Marco Vongola is born as Ricardo's only son.

1870: Having taken control of most of Europe criminal underground, the Vongola Crime Family begins seriously expanding its operations in other areas of the world.

1871: Claudia Vongola is born as Ricardo's only daughter.

1883: Chiavarone-Vongola Massacre: Ricardo and most of his Guardians are gunned down alongside other high-ranking mobsters by rival mafia members. Marco Vongola at age 14 formally becomes the Vongola Terzo.

1887: Simora Vongola is born as Claudia's son.

1890: Fraternal twins Antonio and Gilberto Vongola are born as Marco's sons.

1908: Fabio Vongola is born as Simora's son.

1910: Vongola Succession Crisis: Marco unexpectedly suffers a heart attack and dies. Simora refuses the crime boss position as he devotes himself to a civilian lifestyle and a career in academics. Gilberto is bedridden in Russia after a failed assassination attempt on his life. Though initially reluctant, Antonio Vongola at age 20 formally becomes the Vongola Quarto.

1916: Disappearance of Vongola Quarto: The fighting of World War I disrupts mafia activities. Antonio's best friend, the heir to the Bovino Family at the time, is drafted into the war. When Antonio tries to fake his friend's death to get him out of the front lines, the both of them are unfortunately captured as prisoners of war. Antonio is presumed dead. Since the Vongola Family required leadership in the midst of a war in their home country, Gilberto at age 26 formally becomes the Vongola Quinto.

1918: Antonio returns home after the war. He allows Gilberto to remain the boss without complaint. Antonio joins CEDEF and later becomes a world-renowned chef.

1925: Daniella Vongola is born as Fabio's daughter.

1926: The Arcobaleno Hunt: Gilberto is assassinated by the current incarnation of the Arcobaleno. After being persuaded by Antonio, Simora at age 39 formally becomes the Vongola Sesto. Simora initiates a purge against the Arcobaleno. The Vongola Family come into conflict with the Giglio Nero Family, whose boss at the time felt passionately obligated to safeguard the lives of all Tri-Ni-Set holders. While negotiations are successful in ending the hunt and restoring peace between the mob families, the Vongola and Giglio Nero remain tense with one another, dissimilar to the close relations their predecessors had once shared.

1939: Timoteo Vongola is born as the son of Daniella Vongola. With fighting breaking out with the beginning of World War II, Fabio sends her and Timoteo to America for their safety.

1940: Simora Vongola is betrayed by business partner Benito Mussolini and murdered. Fabio at age 32 formally becomes the Vongola Settimo. Swearing vengeance, the Vongola Family joins the Allied Powers against Italy.

1946: Fabio is assassinated. Daniella Vongola at age 21 formally becomes the Vongola Ottavo.

Killer Reborn Era

1967: July 17th – Henry Tomasino is reborn as Federico of the Vongola Crime Family.

1970: Aria of the Giglio Nero Crime Family is born.

1971: June 15th – Iemitsu Sawada is born.

1974: The Vongola Ottavo, Daniella, steps down from her boss position. Timoteo Vongola at age 35 formally becomes the Vongola Nono.

1975: March 31st – Nana is born.

1978: October 10th – Xanxus is born.

1981: While on a hit contract, an Adult Reborn watches as Henry at age 14 find the target first. Henry commits his first kill of his reincarnated life. When the victim's family members kidnap Henry and his teenage accomplices in retaliation, Reborn rescues them. Soon afterward, Timoteo hires Reborn as Henry's personal home tutor.

1985: Xanxus at age 7 is adopted by Timoteo Vongola. Timoteo's blood sons Enrico and Massimo are dismissive of Xanxus, so Henry is left the brunt of the responsibility to look after Xanxus whenever Timoteo is too busy handling the family business. Xanxus and Henry inevitably grow close with one another over the years.

1987: February 4th – Dino Cavallone of the Chiavarone Crime Family is born.

1988: Henry and Aria meet one another by chance when they shadow Reborn and Luce on a private Arcobaleno mission. Henry and Aria soon begin a romantic relationship.

1990: Vongola v. Tomaso: Henry takes a contract to assassinate a member of the Tomaso Crime Family in Namimori, Japan. During his mission, Henry meets Iemitsu. The two strike up a friendship. Once the contract is successfully complete thanks to essential help from Iemitsu, Henry introduces him to Timoteo. Impressed by his efforts, Timoteo allows Iemitsu to formally join CEDEF.

1992: When Aria unexpectedly becomes pregnant, she and Henry contemplate leaving the mafia. With Reborn promising to help them fake their deaths, they commit to their dreams of living normal lives. However, Timoteo is well aware of their intentions. Not wanting to lose his favorite candidate for the Vongola Decimo title or to disrupt the long-held tradition of keeping the Vongola and Giglio Nero bloodlines separate, Timoteo hires Shamal to cause Aria to have a miscarriage.

Under Timoteo's orders, Aria and Henry break off their relationship and resume their roles in their respective crime families. Henry remains vindictive and distant with Timoteo.

1994: Vongola Civil War: On the same day of the marriage between Nana and Iemitsu Sawada, Henry initiates a rebellion against Timoteo's rule over the Vongola. In the final battle of the civil war, Henry defeats Timoteo in combat, but Reborn prevents the maimed and weakened Henry from landing the killing blow. Henry sets off a bomb in an attempt to kill them all. Reborn and Timoteo survive. The remains of Henry's bones are found and used to confirm his death.

Tenth Generation Era

1995: July 23rd – Joe Barbaro is reborn as Basil in Italy.

October 14th – Vittorio "Vito" Antonio Scaletta is reborn as Tsunayoshi Sawada.

December – The Fated Day: Reborn and the rest of the current Arcobaleno candidates of the time, plus Colonnello, are transformed into toddlers and given their respective pacifiers. With Shamal owing a very heavy debt to Reborn, Reborn has him erase all records of his adult self so that the infant Reborn can begin a new hitman career with a relatively clean slate.

1999: January 11th – Fuuta de la Stella is born.

2000: Reborn becomes 13-year-old Dino's home tutor.

2001: Timoteo visits the Sawada family. Upon Iemitsu's request, Timoteo places a seal on Vito to lock away his Sky Flames. Recognizing that Vito retains memories from another life, Timoteo also attempts to seal away those memories. However, interference from Tsuna's soul allows Vito's mind and past memories to remain dominant while Tsuna's personality is locked away behind the seal. Tsuna is confined to being a silent observer of Vito's life.

2002: October 14th – Haunted by memories of his old life, Vito runs away from home. Before long, he is adopted by Makoto Kozato, the current boss of the Simon Crime Family. While Iemitsu leads the search for his son, Makoto ensures Vito's true identity of Tsunayoshi Sawada is kept hidden. Living in the Kozato house, Vito grows close with his new siblings, Enma and Mami, and his newest mother, Magi.

November – Cradle Affair: With CEDEF distracted with Tsuna's search, Xanxus leads his own coup with the Varia against Timoteo. By the end of the incident, Timoteo entraps Xanxus in ice conjured from the Zero Point Breakthrough: First Edition technique. Iemitsu is forced to give up time on searching for Tsuna in order to investigate and eliminate any further remaining usurpers and mutineers like Xanxus and Henry within the Vongola.

2003: April – Flood of Blood: A mysterious illusionist slaughters several CEDEF agents and attempts to murder the Kozato family to instigate a war between the Vongola and Simon Families. Magi Kozato is killed. Makoto Kozato overpowers the illusionist and forces him to retreat. Makoto agrees to work with CEDEF to track down the fugitive, but in return for the Vongola's help, Vito is returned to Iemitsu's guardianship.

July – Joe is kidnapped by human traffickers en route to Rome. Iemitsu and a CEDEF team assault the traffickers and free their captives. Lal Mirch and Iemitsu become Joe's informal guardians as he joins CEDEF.

2005: January 15th – Aria gives birth to a daughter, Yuni.

2009: By Vito's 14th birthday, he has become the head of a sizable gang, informally known as "Vito's crew", in Namimori, its strength and influence rivaling the Momokyokai Yakuza and the Namimori Disciplinary Committee.

2010: April – Daily Life Arc: With the untimely death of Enrico Vongola, Reborn arrives in Namimori to become Vito's home tutor. Whenever Reborn shoots Vito with the Dying Will Bullet, the effects of the seal Nono had placed is briefly nullified. This allows Tsuna temporary control over his and Vito's shared body. As such, it is Tsuna's dying wish that is carried out whenever Vito enters Dying Will Mode instead of Vito's.

September – Kokuyo Turf War: The Kokuyo Gang attack and severely injure several members of Vito's gang and the NDC. Mukuro Rokudo orchestrates the kidnapping of Fuuta. Vito leads a team to assault the Kokuyo Gang. In the process, Vito's seal is briefly weakened when Mukuro attempts to possess him. Mukuro is overwhelmed by Vito's memories while Vito shares a brief conversation with Tsuna within their shared mindscape. By the end of the turf war, Mukuro is defeated as Vito as unlocks Hyper Dying Will Mode and gains a new animal companion: Brasi the bulldog. While Tsuna's consciousness is locked away again, the seal remains weakened.

November – Vongola Ring Conflict: Henry resurfaces, having survived his attempted suicide bombing, and discreetly frees Xanxus from his frozen ice prison. The two develop a new plan to take over the Vongola and the mafia world at large. Henry secretly incapacitates Timoteo and poses as him to begin the Ring Conflict. They intend for Xanxus to become the Vongola Decimo. Later, they plan for Henry to assume leadership of the Giglio Nero Crime Family.

Vito and Joe reunite and train together in preparation for the Ring Battles. When Timoteo removes Vito's seal to unlock his latent Sky Flames, Tsuna's personality is also freed. Vito's fighting prowess and Hyper Intuition have increased in strength and accuracy, but Vito and Tsuna briefly struggle for dominance during a few moments in the Sky Battle. After Vito and Tsuna defeat Xanxus, Henry appears and attempts to persuade Vito and Joe to join him against the current Vongola leadership.

Henry admits to wanting to kill Iemitsu, Lal, and Reborn for their inaction and/or ignorance when Timoteo ordered the death of Henry's and Aria's child, and for siding with Timoteo during the Vongola Civil War. Ultimately, Vito and Joe refuse. Eventually, Vito lands a crippling blow on Henry. When Henry's unique Flames allow him to heal his injuries and remotely restrain Vito and Joe for easy kills, Iemitsu and Reborn step in and execute Henry.

A celebration is had for Vito's victory in the Ring Conflict and his official inheritance of the Vongola Boss title as Decimo. However, Vito is suddenly hit by a rocket with pink smoke reminiscent of the Ten Year Bazooka. Once the smoke clears, Vito's mind and consciousness have disappeared, leaving only Tsuna in control.