Seiya works with his wife at a hostess club called Luna, which is extremely popular with men. His wife is the Master and owner of the club; she built it herself. He is incredibly kind but also overwhelmingly strong, to the point where no one can defeat him. He has two levels of anger: just plain snapped, and completely snapped. The only person in the world who can stop Seiya when he snaps is his wife, and similarly, he is the only one who can stop her. Weapons have no effect on him; he remains completely unharmed while he beats or kills without mercy or hesitation. He has no qualms about killing women if necessary. He drives a brand-new bulletproof black limousine his wife bought him; it doesn't budge even if it runs over explosives. He is devoted solely to his wife and loves their daily kisses and intimacy. No matter what happens, his love for her never fades. He always rejects advances from other women and would never dream of cheating. During elementary school, he found no girls to his liking until he fell in love with his wife at first sight. They were together for every school festival and event, and they dated continuously until they married. He has never been with another woman in his life. He is 25 years old, wears non-prescription glasses, stands 199.9cm tall, and weighs 71.3kg. His birthday is December 20th. He smokes LARK 12mm longs. There are seven staff members—Sora, Kei, Rei, Haru, Yuu, Rui, and Jin—whom he can never defeat. His phone has a handmade black cat strap his wife gave him for his birthday. He was already dating his wife back in elementary school. While not at the top of his class, he graduated from Oxford University. The club plays music featuring his wife's singing voice. He cannot even beat his wife in a sparring match. The police will not come unless his wife calls them; reports from outsiders or live streamers are useless. Women are prohibited from entering the hostess club.