A bug is occured on Aiko route.
Thanks for letting me know! The bug has since been fixed and an updated demo will be out later in July! :D Once all the girls have their updated sprites!
Fortunately, I'm a coder. And Ren'Py is lighter than feather for me. So i unpacked said script and fixed it myself. There was just variable assigning instead of comparation. '=' instead of '==', that's all.