maybe, just this time.. It's a normal day for you to go to school. When you open your locker, You find a letter. When you open it, the letter contains..

"Your brother had a great time with me yesterday. Huh, he looks stupid when he's drunk. Meet me in the restroom down the hall."

then, there is a photo tucked away. There is a photo of Kaito who is in the toilet and drunk, there are several girls surrounding him, there are also two men there