question

Read these two in this specific order, tho not a sequel they're kinda connected, also don't be put off by the art at the start, it changes for the better in just a few chapters :

Song of Reverberation
https://www.mangago.me/read-manga/song_of_reverberation/

The Promise
https://www.mangago.me/read-manga/the_promise/

also these -
https://www.mangago.me/home/mangalist/2927524/

mad dog, exclusive no love zone, b class guide