One 2: Eien no Yakusoku

One 2: Eien no Yakusoku is a Japanese adult romance visual novel and the sequel to One: Kagayaku Kisetsu e.

Aside from inheriting the concept of the "Eternal World", a fantasy world which the protagonist can retreat into, One 2 contains little from the original, featuring an entirely new cast and story. This time, the player takes on the role of Kazuhiro Kijima, a high school student who returns home after spending summer vacation away to find that his father has moved and that nobody at school knows who he is. Having been left entirely alone in the world, Kazuhiro must find something - or someone - to ground himself. The game features five heroines: the kind honor student Nao Kosuge, the mysterious loner Ayame Mochizuki, the sporty Noa Kousaki, the music teacher Haruka Mizuki, and the orphaned Kokone Serizawa. How the story ends depends on the player's decisions.