及川譲

在樱井学园成为和宏同班同学的男生。 讨厌和别人黏黏糊糊地交往，除了自己中意的人以外，很少和别人说话。 在班级里是边缘人般的存在，但擅长运动，学习也不差。 和本该是讨厌类型的小菅奈穗是老相识，但似乎并不是单纯地关系好……

简介来自 Bangumi · 由机器翻译生成

My first friend is a reliable loner with a sense of justice. A male classmate of Kazuhiro's in class 5 of the 2nd grade. On the opening day of the new semester, he and Kazuhiro had an unlucky collision on their way to school. He and Kazuhiro had an unfortunate collision on the first day of the new school year, which led to their friendship. He has excellent grades and high athletic ability, but does not participate in club activities. He is a loner in his class. For unknown reasons, he does not get along with his parents, which seems to have cast a shadow over Oikawa's personality. He has known Naho Kosuge since they were in the second year of junior high school. They have maintained a mysterious relationship, neither close nor estranged. While Oikawa looks at Naho with his characteristic wary gaze, he may envy the existence of Naho, who "lives alone" without depending on anyone.

简介来自 VNDB

　櫻井学園で和宏のクラスメートとなる男子。 　他人とべたべた付き合うのが嫌いで、自分が気に入った人間以外とは滅多に話さない。 　クラスではアウトロー的な存在だが、スポーツも得意で、勉強も苦手ではない。 　嫌いなタイプのはずの小菅奈穂とは昔からの知り合いだが、単純に仲が良いわけではないらしい……。

简介来自 Bangumi