Kanojo ni Norowareterukedo Shiawase Nanode OK Desu ☆

For seventeen-year-old Iida Harunari, being kind to girls is the most important thing. He is exactly the kind of guy who carries the bags of every girl in his class to school with him each morning, a routine that leads those around him to sarcastically call him the "ultimate gentleman Iida." His ordinary days of courtesy take a strange turn when he encounters Kageura Sari, a beautiful girl with an unsettling aura. When Iida notices a cursed-looking monster emerging from Kageura's body, he intends to hurry and flee. But something is amiss: instead of escaping the danger, he has been cursed by the heroine. The ultimate gentleman's simple life is now entangled with a supernatural affliction, all because of a girl he met by chance.