Hadakaken (2021)

Akira (Mako Komaki ) gets attacked by vigilantes but is rescued by Tetsuko (Tenshi Moe), a user of the "Hadaka-ken" technique. She tries to learn the technique herself to save her trapped boyfriend, but it is a technique that causes the other person to climax to death during sexual intercourse. Using "Hadaka-ken" also means losing your virginity. Will she choose to protect her boyfriend or her virginity?