Rin initially suffers from amnesia and does not remember who he is, except for his name and a desire to play a certain melody on the piano. The two met under tumultuous circumstances as Rin was fleeing from a mysterious pursuer. Rin serves as Vincent's calm amid the storm of tensions between him, Catherine and Katherine McBride. Rin acts as a healing presence for Vincent through the nightmares and exemplifies new values. He is one of the possible love interests of Vincent Brooks.

Rin (リン Rin), also known as Qatherine due to a misunderstanding, is a major character introduced in Catherine: Full Body who does not appear in the original Catherine. I'm so glad I met someone as nice as you, Vincent.' - Rin to Vincent I was so scared, I couldn't remember anything. also providing me a job and a place to stay. 'I wanted to say thanks, not just for saving me, but.