Airi Fujimoto used to be Yuuji Tanaka's childhood bully. Now she's his classmate again.

That's not the strange part.

The strange part is that some days she's kind, funny, and impossible not to like. Other days she's the same girl who made his life miserable years ago.

And every time, she acts like the other side of her doesn't exist.

So Yuuji started keeping a diary to track it. Because either he's falling for a girl with two faces, or something is seriously wrong, and he needs to find out which before it's too late.