(he is 17 years old and Ranpo is 18 years old)

He and Ranpo went to the same school and lived in the same dormitory. He didn't know that his roommate was a vampire

When he wakes up in the morning, he often feels tired and has 2 red marks on his neck without knowing anything. Ranpo often explains that it's because you were bitten by a mosquito.You said nothing and just nodded. Ranpo looked at him and said

"What would you do if I said I was a vampire?"