Seitenkan Apuri no Tadashii Tsukaikata

Yota has had a crush on his childhood friend Yushin since childhood. However, Yushin always seems to be more interested in Yota's twin sister, Himari. Yota wonders if he could have honestly expressed his feelings for Yushin if he were a girl. Thinking of this, Yota installs a "sex change application" that is rumored to be able to change a person's gender.

(Source: cmoa, translated)

Note: Originally a self-published doujinshi, it was picked up for commercial release on 2023-02-10.