白川 公康

Nanami's cousin, a Ronin student.
At Nanami's aunt's request, he stays at the protagonist's house for a while to take intensive courses at a cram school.

Ever since he was a child, he had a vague admiration for the kind and beautiful Nanami, but now that they are living under the same roof, coupled with the depressing situation of being a repeat student, he can no longer suppress his twisted desires...

He feels a lot of pressure from his parents to pass the entrance exams, but he doesn't really want to go to university.
Of course, he goes to Tokyo for the intensive courses, but he also comes to attend the big doujinshi sales event that takes place twice a year.