Osanai ropes Kobato into her plans for the summer vacation. However, the cake he is supposed to buy for her proves to be irresistible, even for Kobato.

To top off their summer sweets tour around the city, Osanai treats Kobato to a Tropical Parfait as thanks for rescuing her. Along with this delicious treat, Kobato is also served the whole truth about Osanai's kidnapping.

After starting to get involved with Osanai, Itsukaichi investigates a possible string of fires in the city.

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

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