Kono koi wa kakuchō genjitsu?.

Elena, who lives with her fiancé Koichi, harbors secret feelings for a woman but is unable to confess them to her. One day, Elena learns that her neighbor Jiro has been selected as a test user for a mysterious service that allows him to experience the romance of his dreams. She decides to snatch the right from Jiro... [Exists in two different versions (R15+ and R18+) with different titles].