Natsu e no Hakobune II

After months away, the protagonist returns to his hometown for his first summer vacation. Though circumstances have changed, his summer begins as usual—until an unexpected discussion about his cousin's arranged marriage arises. Through deep connections with his cousin, younger sister, and childhood friend, he uncovers their hidden feelings. Set in the countryside summer, the alluring love and desire of these three girls intertwine, sparking an immoral love story.