The story revolves around Tomoya Mizuhara, a 13-year-old boy who suddenly gains a big sister when his father remarries. 17-year-old Ichika is a little strange, and her affection for Tomoya is rather overwhelming, if not scary. On top of things, Ichika's friend Ruri is the ultimate sadist. Then there is Ichika's big-breasted quarter-Japanese friend Marina. (Source: ANN)

Genius inventor Null tragically loses her older sister Peta in an accident. To get over the grief, Null develops "Peta Robo," a robot with the same characteristics as her late sister. However, the robot is a little different as to what Null expected. (Source: MAL News)

A recap special (episode 39.5) of Zettai Karen Children. Narrated by "The Double Face" (Nowaki Hotaru and Tokiwa Natsuko), the episode introduces all the characters in B.A.B.E.L. with their abilities and roles etc. It also shows various facilities and places in B.A.B.E.L that have appeared in the story.

The continuation of Yurumates 3D right after the first season.