Forget Me Not Vol. 4 (Kodansha, 2016)

Serizawa started a relationship with Yamaguchi even though he was interested in Tsukushi. But after living in a confusing and vague love triangle, he can no longer suppress his feelings for his friend. Serizawa must now make a painful choice in order to truly face Tsukushi. Will he be able to start fresh, or will he lose both people he cares about? As a young adult, Serizawa also struggles with memories of his childhood. And in a dark time, he meets someone from his past that he never thought he'd see again…