Ičigan issoku (S01E01)

Iwanaga Kotoko experiences love at first sight with Sakuragawa Kuro, who she happened to randomly bump into at the hospital. Two years later, Kotoko seizes her chance and asks Kuro to date her with marriage in mind. Kuro tells her about when he and his ex, Saki, broke up, but Kotoko seemed to already be aware of the situation. Bake-danuki then appears before Kotoko, telling them that the barrier around the library had been broken, and... (Crunchyroll)