Misaki-kun no Bukiyou na Dekiai

Kyoka, an office worker, is in a relationship with Misaki, a university student who is seven years her junior. They've been living together for three months, but Kyoka has started to notice troubling behaviors. Misaki often stays out late, spends a lot of time on his phone, and the couple hasn't been intimate recently. He has never told her "I love you," which adds to her concerns. As Kyoka begins to suspect infidelity, her doubts are heightened by an unexpected incident that occurs on her birthday.