Ameagari no 10 Nenme

From MAL: Even though ten years have passed, Kouji Hanajima can never forget his first love toward his friend Shoichi Kurose. When fate brings the two back together again, why has the kind and gentle Kurose turned this bitter? Included one-shots: Amai yo, Sensei (Sweet, Teacher), Bokura no Natsu (Our Summer)