load it with mtool. it´s made with the new engine "sugoi". still has some problems with some words, but it´s very enjoyable.
BUT MOST IMPORTANT!!!!!:
in mtool change your font to UD Digi Kyokasho N-B !!!! that´s really very super ultra important!!!
otherwise your text will only be some weird squares and the game will unfortunately crash because there is some permanent language-check ingame running, which permanently checks if you are using japanese language. maybe you already have heard of this, because the latest "re:bf" has this mechanic too.
EDIT:
i just give up! this game still crashes even after using japanese fonts, official japanese fonts. i don´t know why and i don´t care anymore. if someone has the mood to figure it out, please do so. i wont try it anymore, because after multiple crashes while translating this game, multiple crashes while playing this game and multiple crashes while trial-and-error with these fonts, my patience is a its limit. have fun with the translation.. im out...