Armed Detective Agency members discuss the most suitable candidate for the second-in-command. Doppo Kunikida is carrying out official errands as planned in his diary as usual. Unexpectedly, a bomb-related incident occurs, challenging the ideals he has always upheld. When weighing one life over hundreds, how will he proceed?

A new Sayonara Zetsubou Sensei OVA.

At a remote hot springs lodge, Yona and the team rest. The boys are taking a bath with the exception of Ki-ja, who looks troubled. Jae-ha takes this chance to tease him, unwittingly finding a mark linked to the previous White Dragon—whom coincidentally is also Ki-ja's father—prompting Ki-ja to recall their complicated relationship. In another time and place, Son Hak and the dragons banter as they hold a drinking contest. As they start to doze off one-by-one, Zeno dreams of his past, where his abilities and experiences, both as a person and as the Yellow Dragon, are revealed.

In the southern country of Banana island, the energetic princess and his humble servant Banna invite Anpanman and his friends to their biggest festival "Banana Matsuri". But when they arrive a stormy and cold day bestows the island and withers all the Banana crop. While searching for the cause on the Banana Mountain a water monster appears that threatens to take back the island to the water world. With the help of Banna, can Anpanman and his friends rescue the island from this crisis?