Tokyo, early April.

"Usagi-san, breakfast's ready". Thus starts the usual day on the Usami's condo. But unlike the usual days, this time Usagi-san doesn't reply at all.

"He should've made another all-nighter, so he might not want to be annoyed" thinks Misaki. But to satisfy his curiosity, he walks to the Usagi-san's room. "Usagi-san?"

Misaki knocks his room, but got no response. He then tries to open the door, but it's completely locked inside. "He should've very busy, just not annoy him or he'll sexually harass me for sure". Then Misaki leaves, eat his breakfast alone and do another housework chore, as a repayment for his stay.

"Usagi-san, I'm off to work!"

No respond. Misaki is starting to worry. "It's been 10 o'clock. He'd never wake up this late. It must be anything bad happened to him!"

"Usagi-san! Usagi-saaaaaaaaaaaan!"

He breaks to Usagi-san's room, the thing he would never normally do. Usagi-san is asleep, his face is very pale. It seems like he had lost his consciousness.

"Mi… sa… ki…"

"Usagi-san! What happened to you? I'll call the doctors"

"No… ple… ase… stay be…side…. Me."

Given such reaction, Misaki is totally panic. Unable to move, his body trembling. In his panic, he open his cellphone and calls ambulance. "This is an emergency! Could you send an armada to this address?" said Misaki, giving the condo's address and security code.

"I'll be working and the ambulance will be here soon, please be brave… for me?" Asked Misaki in the trembling voice. "It will be all right; I'll always stay for you"

He tried to call Marukawa, his workplace. But nobody picked up, except the voice mail. Same goes with Aikawa-san's cellphone. However, 30 more minutes, Aikawa sent him a mail.

"Misaki-kun, what's up? Something to deal about Usami-sensei's deadline? And where the hell are you, not coming to the office!", complete with those angry emojis.

Being too anxious as it's already an hour after he called the ambulance and it still doesn't come, Misaki answered Aikawa's email unwillingly.

"It's all right, it's just some glitches here. I'll come"

Aikawa noticed the differences of that mail compared with Misaki's usual mail, and even though she's not that sensitive, she just got as anxious. And Usagi-san's deadline is almost there as well, so she thinks that she should give them a visit somehow.

"Okay, I'll come there. Please wait for me!"

By the time Aikawa's email sent, the ambulance came. Misaki guided the medical staff to Usagi's room.

"It's all right", Misaki said to Usagi. He followed the ambulance downstairs, and entered the ambulance.

He forgot to leave a note for Aikawa. And in the way to the hospital, his phone's battery is completely empty, so that Aikawa couldn't reach the two in panic.

By the time Aikawa arrives to the condo, the condo is empty, nobody inside. When she entered Usagi's room, she only got his password-protected notebook, so she can't get the writing in time. She tried to call Misaki, but no use, his phone is off.

She went downstairs, and asked the condo security man.

"Do you know where those people on the top floor go? And since when?"

The security man, who is just back from his back office and exchanged shift, feel clueless. "I don't know"

Aikawa comes back to Marukawa hopelessly. "Usami-sensei!"

In the hospital, Misaki panicked.