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

MangaShounenOngoing🇯🇵 First published in 2021ComedyRomance

Yuu Omiya story · Youhei Kazawa story, art

Just days before Christmas, college sophomore Hasegawa Yuuta gets the worst kind of holiday surprise: his girlfriend’s been cheating on him. Depressed and dodging couples on every corner, he stumbles into Shinohara Mayu—an irresistibly bold underclassman dressed like Santa and full of mischief.

Synopsis via AniList