Shirushi (印)

Overview
Shirushi (印, lit. mark/sign) is a Japanese Yume Nikki Fangame created by TaSK in RPG Maker 2000.

Gameplay
You star as Yatsuki (やつき), a boy that refuses to leave his room. He can travel to the dream world by sleeping on his bed. His main task is to collect Stoicheios in certain dream worlds. You can save the game by interacting with the notebook on the desk.