Complete raws:
https://syosetu.is/manga/%e3%82%aa%e3%83%a1%e3%82%ac%e3%83%bb%e3%82%b7%e3%83%b3%e3%83%89%e3%83%ad%e3%83%bc%e3%83%a0-raw-free/
https://battwo.com/series/147910
JUST VOL 1
english (only main story)
https://xbato.com/series/105247/omega-syndrome
Spanish
Group fb album: https://www.facebook.com/media/set/?set=a.902812640141808&type=3
Fb group: https://www.facebook.com/Nowa.aaaaaaa
Group page: https://contenidodelblogno.blogspot.com/2022/10/sindrome-omega-activo.html?m=1
Alt page: https://es.niadd.com/original/10044556/chapters.html
Extras page list:
https://www.mangaupdates.com/series/sv0eorj/omega-syndrome-bangaihen
Omega Syndrome