Satsuki and Yayoi decide to visit their brother Hazuki, who is studying in the realm of Ulster. While following a stray cat, Satsuki stumbles upon a mysterious mansion. There, he will meet the owner, a fascinating hikikomori with an attitude, and the beautiful, friendly butler. After a series of circumstances, the brothers end up running up debt after debt, and they'll be forced to work at the mansion until they can pay them off!

Satsuki and Yayoi decide to visit their brother Hazuki, who is studying in the realm of Ulster. While following a stray cat, Satsuki stumbles upon a mysterious mansion. There, he will meet the owner, a fascinating hikikomori with an attitude, and the beautiful, friendly butler. After a series of circumstances, the brothers end up running up debt after debt, and they'll be forced to work at the mansion until they can pay them off!