Oh i really love this, the UI is so clean and pretty and the love interest is such a cutie - the concept is so interesting and fun too! however, a bit of constructive criticism if i may.
id like to bring up the topic that since JP is very different from English, there can oftentimes be many translations and paraphrasing options in translating even a single sentence - meaning multiple translations can be "correct" but not taken as so inside the game. I think an answer key either as a downloadable document or directly ingame would be nice! (in other words i cannot for the life of me figure out the de-ciphering puzzles lmao)
and then a super minor issue and a suggestion - Louise's model (and the ui) seem to have scaling issues when window size is adjusted or the window is put into fullscreen, the model being cut and the ui being wayyy too tiny.
Also, it'd be nice if we could open the book log while talking/inside the chapter rather than having to leave and go to the main menu.
Still, this game is something i among many couldnt ever dream of making, i really like it, hope you can continue development and stay motivated!!! :D