Taken from In The Water:
Naho Yoshihara just wants to be an oridinary first year, but Kouki, her brother, won't stop pressuring her to join his band, ZIP! At a young age, her brother had convinced Naho that she had super human guitar playing powers, but now she's no longer convinced. How will her brother and his bandmates trick Naho into playing with them at their school's festival?

Taken from In The Water:
Rita Hoshiyama is a second year in middle school and claims to be a rock musician! However, her parents disagree and insist that Rita take up cooking and their family business. But when Sakuya-kun, her idol and family's new dishwasher, ask her to do a live performance the next day, she couldn't help but agree! The problem is, there's only two people in her band...

Shizuku Ishiai, a 2nd year middle school student, loves dancing, but is bad at expressing herself, so she crossdresses and posts videos of her dances on the popular website "Smile Douga", under the alias "Ai". And she had declared the "dancing prince", Hayate, her rival. But, after a few unexpected events, and her attempts to best him, she's somehow thrown into an idol unit with him; furthermore, a MALE one?!