If i remember right a lot of the cells are just locked and you cant enter them as there's not a key for them more there for decoration. But saying that I believe one doors at a end of a corridor is locked and you need to beat someone up first or ask someone for the key.
Might be worth asking in the game thread instead see if anyone knows instead on the translation thread as mods are very touchy on talking about game stuff in the translation topic and vice versa.
https://ulmf.org/threads/ankokumari...n-girls-hard-f-ck-rpg-re162307-rj162307.7401/
but i guess worse case scenario give it a bit till the translations done.
Roger that, thank you kindly!