omori - how to unlock black space 2

conditions: hikikomori route, one day left how to open the piano room (secret room): read all the books in this library Timecodes: 0:00 opening the piano room 0:25 collecting the sheet music 1:02 placing the sheet music 1:38 defeating something in the dark 1:50 defeating something in the walls 1:59 defeating something in the water 2:11 running back to the white space 2:45 entering the black space 2 2:56 entered the black space 2 P.S. - am i first person on the internet that created 4k video about omori?.....cool (yes i know that this is a pixel game) (English is not my primary language, so if I made any mistake when i wrote this, please forgive me)