The story is about a girl who is asked by her friend's younger sister to do a 'nighttime bride training'! I want you to be my bride training." "Bride training ...... training?" I've tried all the housework with my brother, and now I'm going to try ...... to help you with that ...... nighttime bridal training, or rather, ....... I'm not sure if I'm going to be able to do that. I 'Mitsuyoshi Bunbu', 'Natsuhiko Nakagawara' and his sister 'Nanaka Nakagawara' have been childhood friends and have spent time together since we were little. Now it is not so unusual for Nanaka to come to my room as a man, and for some reason, she calls me "big brother" only when we are alone. One day, she said something like that. 'You're training to be a bride for the night? Yes, I'm a night bridesmaid. Is there a difference between daytime and nighttime bridal training? The first thing to do is to make sure that you have a good idea of what you want to do. Why me? Why don't you ask Natsuhiko? What? How can I ask my real brother to do such a thing? I didn't ask him back. I did not ask back. I didn't ask back, "No, what kind of things? So please!