Just curious before purchasing, is this game a Visual Novel that has multiple routes/endings or is it a Kinetic Novel that has zero choices and just progresses start to finish?

Every time the game launched it gives me this error, and the only thing I see is the console: スクリプトで例外が発生しました ANSI 文字列を UNICODE 文字列に変換できません。現在のコードページで解釈できない文字が含まれてます。正しいデータが指定されているかを確認してください。データが破損している可能性もあります...

Unversioned hotfix (22/3/2021) Fixed a display bug that made it look like Shuuichi is attacking multiple targets when using the Attack command against the Demon Lord. Unversioned hotfix (6/9/2020) Fixed a line in Nene chapter not displaying correctly when playing in Japanese. Unversioned hotfix (3/9/2020) Fixed certain graphics appearing in English when playing in Japanese. Minor text fixes. Purple Envelope Update now live...

She's very cute, i want to have romance route with her

I'm missing the CG that's in between the one where Mari is hugging Shuu's mom and the one where Ichiru is playing a console game. Anyone know which one it is, and how to get it?