Akane and Sumire seem to have gotten closer, and Taiyou can't help but feel a little jealous. Akane, Taiyou, and Hino go on a trip to the zoo. And Christmas is just around the corner, which means festivities and romantic dates!

Retrieve the ticking time bomb planted in classroom 5-1 at once! Taiyou finds himself suddenly entrusted with this top secret mission. The fate of his classmates is in Taiyou's hands! The bomb's location is... inside Akane's locker?!