technically this is an isekai theough inheritance. thus applies mostly for the seme and uke. the other warriors are from the the dimension they were in and is looking for the clansmen.
The plot gets complicated the further you go. It starts with Amano Kouichi awakening strange powers within himself. His powers and magnetism draw unusual and equally powerful people to him - including the heir of the Touya family, Touya Kazuomi. With the help of Kazuomi, Kou begins to unravel the secrets of their families and of his and Kazuomi's own past.
Thank you everyone. I think I'm starting to remember little by little
Can anyone get me a bit summary about this manhwa ?