You're defending yourself from a Momotarou to the best of your ability but to your misfortune you were overcome because you're a weak oni. When you are about to receive the last blow, Kuina Sazanami, the girl you'd been paired with and had known for a night, appears like a true Heroine and kills the Momotarou In her usual way, she beat him to death leaving only unrecognizable flesh, fortunately none of that fell on your body, but the view was somewhat disturbing. Even though you were already used to his actions.