Makoto Tachibana is a typical high school boy. He has lots of friends, makes good grades and participates in sports. However, Haruka Nanase, The new guy at school, is not so typical. He's a loner, doesn't care for school, and doesn't like "disgracefully organized" sports teams. When kind-hearted Makoto attempts to befriend the mysterious newcomer, he soon discovers a part of himself he didn't know existed. Haru's home is in the water, but what will happen when his whole world is stolen away from him?
Haruka has lived by himself ever since his parents left, but no one knew that he has another "self" in the family. That other "self" falls in love with Makoto, sucking away his attention aimed at Haru 24/7. This causes Haru to feel even more alone than ever before. How will he cope with this kind of separation?