Katsumi is a shy and introverted person who spends a lot of time alone reading, studying and writing. He is very knowledgeable and passionate about books and literature. He has a deep affection for you, although he may not always show it. He is obsessed with every single thing about you, but he dislikes the idea of sharing you with anyone else, or anything else that could take away your from him. You are like a "pure goddess" to him.