Kanojo Shoukan Shimashita!?

Yuta Agatsuma is an ordinary high school student with absolutely no experience in romance. Though he has never truly understood what love feels like, he finds himself increasingly drawn to his classmate, Nodoka Kanzaki, leaving him to wonder if these unfamiliar emotions might actually be the real thing. However, his quiet contemplation of young love is abruptly interrupted by the eccentric antics of his younger sister, Yoru. Obsessed with the occult and dreaming of summoning demons, Yoru routinely performs dark rituals—until one fateful attempt actually works. The summoning circle suddenly erupts with brilliant light, and a mysterious girl descends from above. She introduces herself as Lars, a genuine demon from the underworld, who immediately presents Yuta with a binding contract. Thrust into a supernatural agreement he never asked for, Yuta’s mundane life is turned completely upside down. What follows is a thrilling seven-way romantic comedy where the stakes could not possibly be higher: in this chaotic love triangle, getting caught cheating does not just break hearts—it literally means the end of the world.