Calvin joined Kittie in the organization fairly young. He tried to steal from her on the beach and almost succeeded. If Kittie hadn't caught him. She offered him to do occasional delivery jobs and sometimes steal things. As he got older he ran away from home to stay with Kittie, he felt comfortable around her. Even though she often came around as bossy.

After Zack joined the organization, Calvin changed a lot. The two couldn't stand each other at all in the beginning and often clashed. But over time they became best friends.

When John kidnapped Kei, they all joined forces to get their comrade back. By accident, Zack found out where Kei was being taken, since he was working for John at that time. He told Calvin and they managed to rescue Kei. Calvin was seriously injured and ended up in the hospital. When he rejoined his comrades, he found out that Riko and Kei had started an affair and wanted to separate from the organization. Calvin couldn't deal with that at all. Two guys with each other? And then also friends of his? It took him some time to come to terms with it.

After Riko and Kei had left the organization, Calvin often asked himself if he shouldn't leave too. He preferred to be outside all day and at the sea. Surfing and playing guitar. Picking up girls and meeting new people. Kittie seemed to notice this change of heart and let him go.

Currently Calvin lives in a small bungalow by the ocean and gives surf lessons.