Soraji Tsubaki♀

Lecturer at the prep school the protagonist attends. A sleek, mature lady. Her slender figure looks beautiful in her suit. But when she gets home, she changes into a tracksuit, slurps cup noodles, and lives the lonely gamer life, staying up late into the night. Back in her hometown, she was super serious, and thus never got any experience with men. Fed up with the meddling of her worried parents and family, she pretends that she's been playing the field and simply isn't ready to settle down yet. However, once her parents send her cousin to check up on her, she gets desperate and asks the protagonist to play the role of a paramour.

[From NekoNyan]