https://game.nicovideo.jp/atsumaru/games/gm1524?fbclid=IwAR2R1IsUA4k_qHjA8VLfNsXIb5vaUICv1F_L2FyACsw1BinZRDLD_JXSbA0
this is the game version you can play it
I forget the current chapter that I read in sometimes, and I don't want to re-reading to making a mark.
So, I want a function that I can mark it on my own.
Has anyone think like me?