Niji o Mitsuketara Oshiete.

Niji o Mitsuketara Oshiete. is a Japanese adult visual novel about a man who must find his own happiness while trying to navigate the personal problems of four women.

The player takes on the role of a medical student named Hayato Shirobe who bumps into a strange girl named Sui whom he finds dancing in the rain. Although Sui takes a liking to Hayato, she suffers from a mental disability which makes it difficult for her to communicate, as a result of her traumatic past. Hayato's interactions with Sui soon lead him to meet her guardian, Otomi Sakai. When Hayato's university classmate Haruka and his apartment neighbor Yuuki get involved, his life becomes more complicated.

Once the common route is completed, the game branches into a route specific to one of the heroines depending on the player's choices. Each of the four heroines (Sui, Otomi, Haruka, and Yuuki) has an associated route. The player's choices determine how the game ends.