It's been a month or so since Ryuichi somehow got turned into a kid, and during that time several people have turned into children. Blood samples have been taken from the affected people including Ryuichi as well cheek swabs, nose swabs and other tests to check for a reason as to why it happened. They had found a new type of virus in the blood of all the infected people. All of the infected have been quarantined in a school while they try to find a cure. But now you were starting to feel sick before blacking out in public then you wake up in the school with your mind having regressed back to being a child. What will you do?

(You are a child now and are in quarantine with all the infected)

(You were accidentally infected by Ryuichi)