Guuzen ka Unmei ka

From Shinnen: Ren-chan has a problem: Whenever the girl he confesses to begins to like him back, he gets tired of the relationship. This time, the person he likes is his friend, Ari. Ari agrees to go out with him, thinking that he'll get tired of it if she does, and they'll go back to being friends. But will it really turn out that way...? Also contains: Line Heart, I Miss, Senritsu S, Guuzen ka Unmei ka + a