Kanojo ni Uwaki Sareteita Ore ga, Koakuma na Kouhai ni Natsukareteimasu  

My Coquettish Junior Attaches Herself to Me!, I Was Cheated On by My Girlfriend, but My Devilish Junior Now Yearns for Me, 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

During the holiday season of Christmas, Yuuta Hasegawa discovered that he was single after his girlfriend had cheated on him just a few days ago. Feeling down, he had a conversation with his friend Ayaka Mino. Then, on his way home from work, Yuuta encountered a stunning woman dressed as Santa Claus in a lane filled with couples. Her name was Mayu Shinohara. Could this chance meeting with Shinohara be the best thing that has happened to Yuuta this holiday season?