Musuu (夢数)

Overview
Dream Number (夢数) is a Yume Nikki Fangame produced by Marisyan (まりしゃん). It stars Rei (零) a boy who refuses to leave his room.

Gameplay
Being like most fangames, Rei will not leave his room, and the only other option is to save at the desk or dream. A difference with most fangames is that effects are known as "numbers", and are listed as such.

Plot
It is possible that the weather is preventing Rei from leaving, due to his attire and the weather from his roof.