愛しあう事しかできない (Aishiau Kotoshika Dekinai - Nothing but Loving you) is a Japanese adventure game for the PlayStation, released on February 11, 1998, by Coconuts Japan Entertainment. It is an adaptation of the manga of the same name by Erika Sakurazawa, serialized in FEEL YOUNG in 1995. (Source: Wikipedia)

The story follows Nanako, an up-and-coming model who, after being fired from her previous job for her brashness, embarks on a new assignment. There, she meets Etsushi, another model who is immediately taken with her. However, Etsushi is already in a relationship with his boyfriend, Shin. Despite this, Nanako and Etsushi grow closer, leading to a complex love square involving Nanako, Etsushi, Shin, and Mitsuhiko, an actor who frequently expresses his love for Nanako. (Sources: umbrellaterms.neocities.org, AniList)