Sefure no Pride - Hatsukoi

synopsis

At a high school reunion, a 36-year-old single mother, Shoko Morimura (Aika Yukihira), meets her first love, Kazuki Kitada (Sho Aoyagi), and he invites her to a hotel. The pleasure of having sex for the first time in several years makes Shoko want to deepen their relationship but Kazuki has no desire to do so and suggests that she becomes his sex friend - an idea Shoko rejects. She soon learns she's not the only one sharing Kazulki's bed.