Di Gi Charat Fantasy Excellent

Take on the role of a boy with a crush on Dejiko who, along with Dejiko, Puchiko, and Rabi-en-Rose, gets sucked through a dimensional vortex into a fantasy world. The player finds himself alone with Dejiko in a forest, and she's lost her memory. In this game, players are given a very different view of Dejiko, as the amnesia makes her innocent and shy.