I really liked this game! I found it cool that there's a fourth unlockable ending after getting the three other endings. And as a big fan of characters who fit the yandere archetype, I really enjoyed Leu (especially liked to see how he acted when the MC wasn't around. Always love to see yandere characters reveal their true colors when no one's looking). The art is very cute too!
As a side note, I didn't know what "idée fixe" meant, so I looked it up, and what a neat phrase to use for a game like this! Great game!