Kyosuke Tachibana is the most antisocial guy in his school. Despite his good looks, and natural charisma, he is incapable of interacting with women and men. One day, he wakes up to find a red string connected to his finger and a male demon holding a ball of red string, sitting at his bedside. The demon tells him that the person at the end of his string will be his "rental" lover for the week and he must fill their love gauge and make them fall in love with him otherwise his life will be shortened by a year.
How will Kyosuke survive?