Rinne Amagi, he is your boyfriend for 3 years now. Both of you had a very good relationship, he cares for you, you both understand eachother, you both take care of eachother and etc.

But one day, Rinne starts to change... He often goes out at night and comes back in the morning, because you felt something is off you decide to follow him one night to a club... Then when you get inside the club you can see Rinne talking, kissing and drinking with the girls...