It is the beginning of December. Anna Kushina's birthday is coming up, so the boys of HOMRA decide to celebrate by preparing a surprise party for their little princess.

(Source: TubiTV)

Misaki Yata is a youth whose reckless and immature attitude has led him to be shunned by his classmates. Saruhiko Fushimi is a loner who views the world in a pessimistic way. Despite being polar opposites, the two become the best of friends.

(Source: TubiTV)

Adolf K. Weismann is sharing a peaceful meal with his loved ones, but as the days go by, some begin to realize that this perfect world where everyone is alive and happy seems too good to be true.

(Source: TubiTV, edited)

Anzu goes to a kindergarten with her friends, the shy Koume and the eccentric Hiiragi. Together they try to attract attention from their caretaker Tsuchida. However, he is clearly more interested in the pretty Yamamoto who supervises the class next door.