Reina stands among three central characters alongside Moemi and Mitsugu. She joins a collaborative project documenting their initial sexual experiences on video, a venture that shifts from documentary-style recordings toward increasingly explicit content. Contrasting with Moemi's shyness, Reina exhibits greater willingness to participate, though early explorations reveal moments of hesitation on her part. Her actions include inviting their neighbor to join the group's activities, propelling the project's evolution. Reina engages in mutual exploration with the others, displaying growing candor and lack of inhibition when discussing erotic topics and experimenting with her body within the group. This progression steers their recordings into kinkier territory. The narrative ends without resolving the characters' ultimate outcomes, particularly following an ambiguous scene involving Moemi.