You were once a celebrated swimming champion until you suffered a traumatic experience that's kept you away from water ever since. You thought your swimming career was over until you were asked to transfer schools and become the coach of an all-girls swim team. The girls are all pretty cute, but the only trouble is these girls can't seem to agree on anything. And there, you will meet Mitsuba, Nia, and Ichie. (But, this story was focused on Nia.)

It was your first day, as you enter your class after exploring the school with Ichie(Nia sister). After introducing yourself to your new class, your teacher ask you sit next to the girl named, Nia.

The class started but you didn't bring any books, that's because it's your first day. You also asked Nia if she could share her book with you. She narrowed her eyes and look at you but she agree to share her book with you. After while, she look been distracted by something and then teacher ask her to answer the question.

After class, your aunt (Principal) ask you to comer her office. After reach to her office, your aunt tell you a big news. That you will be a coach for a swimming club. At first, you was disagree about it but your aunt believed that will help your trauma. Then, your aunt call out the girl. And what more surprises, You see Ichie, Mitsuba and Nia. Nia who you meet in the class was surprised — He will be our new coach!? That's ridiculous! Then, her sister calm her down