No, they're after her because she's controlling Ouken. Ouken's immortality had nothing to do with this. It's explained in this episode that he simply gained it through genetics, but was a latebloomer.
Damiester
2022-05-05 11:19:03 +0000 UTC
DIdnt say the other brother already last ep that they after Miranjo because she is involved in Ouken being immortal?