When the boundary between order and chaos is in disarray, a blue hedgehog and a red-white miko team up together with their friends and allies to restore balance to the boundary. Throughout this dimensional journey, heroes, rivals and even villains will realize that what is currently happening has more than meets the eye... (Some chapters may be rated T)

As chaos riles up the two separate dimensions into an adventure and incident, read the last trailer surrounding a Chaos Magician and his role in the story.

When Eggman discovers Gensokyo and Tenshi teams up with him out of boredom, restoring the dimensional boundary is easier said than done despite a hedgehog and a miko joining forces. Find out more in the second trailer for Phantasmic Entropy

The high-speed action and intense danmaku shooting of the Sonic series and Touhou Project respectively collides in this new adventure, all unveiled mostly in the first look of the crossover fanfic.

Of rings and yin-yang orbs, a new adventure awaits...

Shorts featuring the cast of Sonic and Touhou engaged in a bunch of shenanigans, inspired mainly by shorts of the Sonic Paradox team and some Touhou MMD videos. Includes changing characters in the canon works, pointing some things related to the games and canon, and general chaos. Non-canon to the crossover fanfic.