Shinjuku Seiya

Japanese name:

新宿 セイヤ

He is a male club Host who a one point had a relationship with Julia, whom he later dumped after an obsessed Ayaka tricked him into putting on an SCM and becomes her slave, he later on becomes Yuuga's slave after he and Ayaka were challenge by Yuuga into a game where he intentionally loses so as to get away from Ayaka's control and later on becomes one of Ryuuou's Slave.

Wikipedia