Sei Yariman Gakuen Enkou Nikki

Based on a doujin game from Orcsoft. A businessman, successful in his career, enters a personal crisis after his wife and daughter depart. Their absence leads him to doubt the value of his diligent efforts. One evening, he is approached by a young woman who proposes a transactional sexual encounter. Having been celibate for an extended period, he rediscovers physical pleasure through this act. This experience leads him to understand that advancing age does not preclude embarking on adventures typically associated with youth.