Kanojo ni Uwaki Sareteita Ore ga, Koakuma na Kouhai ni Idakareteimasu
My Girlfriend Cheated on Me, and Now My Flirty Underclassman Won’t Leave Me Alone!·カノジョに浮気されていた俺が、小悪魔な後輩に懐かれています
College sophomore Yuuta Hasegawa discovers his girlfriend has been unfaithful just days before Christmas. Feeling down and avoiding the festive atmosphere filled with couples, he encounters Shinohara Mayu, a cheerful underclassman dressed as Santa. She begins to engage with him in a playful manner, using every opportunity to be near him. What starts as a lonely holiday season gradually turns into a memorable experience for Yuuta.