The protagonist had started living together with his childhood friend, the otokonoko Takanashi Miyuki.
One day, while leading a life absorbed in sex, he ended up meeting Charles, a video streamer Miyuki had gotten to know through social media.
The person at the meeting place wasn't a fair-skinned, beautiful, half-Japanese girl—but rather, surprisingly, an otokonoko.
Charles wanted to become good friends with Miyuki and the protagonist... With a joyful smile, she suggested they start with sex if they were up for it, to which Miyuki gave a fearless smile and declared that was exactly what she wanted.
Of course, they wanted Nii-ni to help too—at the two of them smiling as they said this, the protagonist felt anxiety, and an expectation that exceeded even that.
His erotic daily life with two otokonoko began.