Urino begins writing articles predicting the locations of the next suspicious fires.

Urino has a plan to catch the arsonist in the act.

Urino's rules spark escalating arson; Hiyori supports him while Osanai gives advice as bonds shift.

Urino and Kobato both arrive at the site of the final fire.

Kobato remembers his encounter with Osanai when they were in middle school.

Kobato wakes up in the hospital and sees a box of chocolates with a message from Osanai.

In the hospital, Kobato thinks back to the circumstances around Hisaka's car injury in middle school.

Kobato finally manages to see Osanai in the hospital, revealing a sinister and terrifying truth.

Kobato and Osanai finally find out the whole truth and get help from an old acquaintance.