Kamitsuite yo Unmei

Ichikawa Riku, an alpha college student who dreams of finding his soulmate, is invited to the home of Shinozaki Yuuri, whom he met at university. He was secretly attracted to the beautiful Yuuri, but after learning that he was also an alpha, they have now become good friends. Meanwhile, Riku is concerned about Yuuri's younger brother, Shinozaki Chikage... "Oh, it's not what I thought!" I knew it was fate at first sight, but the person who appeared before me was a burly ex-delinquent. Chikage, who also longs for a soulmate, seems somewhat saddened by Riku's reaction... "I have a request for you, who is after Yuuri. I want you to bite me." What will become of the fateful love that begins with this contract number...?