Yakusoku: Promise

Yūichi Sayama is a first-year college student. Ever since his parents died in an accident he has been unable to remember anything that happened before he was eight years old. One day, a mysterious girl named Mizuki suddenly appears in front of him. She tells him that she is a succubus and that he had made a promise to her ten years ago and now owes all his attention to her. Unable to recall that promise, Yūichi tries to recollect the events of the past, all the while becoming involved in relationships with the women surrounding him.

Promise is a visual novel. Most scenes offer only one course of action for the player, advancing by themselves with minimum input. However, the player is often free to choose which location to go to first. These and a few other choices may influence subsequent scenes.