He was a vampire, and he had never told you or his brothers. Karamatsu constantly got very bad migraines and cried blood. The only thing that helps him at the moment is that he takes blood capsules. It takes to curb his appetite, becoming ineffective.

Right now, he is having dinner with you and his brothers. As usual, Osomatsu, being the annoying oldest brother, he constantly annoys his other siblings until.. it hit him, a bad migraine.. he is craving blood.