Main character is looking for Aki and Masato's brothers that supposedly were summoned to this alternate reality world. Aki was once Haruto's half sister (before Aki's dad divorced Haruto's cheating mother, in his previous life).
In a totally illogical move, Rio (Haruto) fights with the monster stampede that Reiss set up to capture the Galarc Princess Lisselotte. Rio is able to defeat all of the strongest monsters, and saves Stewart (pushed Flora (second Princess) off of the hill and later blames Rio for Lesce Majesté Stewart is also (the "brother" that tortured and trained Latifa) and Duke Huguenot, the person that sent Latifa as an assassin to kill Rio.
So in this intervention, Rio is saving a lot of the corrupt nobles that have made him a wanted person in the Kingdom of Belrum, and have tried to assassinate him. Completely contradictory, irrational and nonsensical. It doesn't make sense that the main character in this volume is still saving the people that are trying to kill him and do harm to the people he most cares for.
Reiss is the most evil character of this novel, he is the ambassador of the proxia empire in the Belrum Kingdom. Reiss mentioned Lucious, the adventurer that murdered/sexually assaulted/etc Rios' mother when Rios was just 5 years old (12 years ago).
Light novel is full of contradictions, fake drama and nonsensical and illogical actions written by the author. Author created a dystopia alternate world where evil reigns and all of the reincarnated and teleported people go to suffer, get tortured, sexually abused, physically and mentally abused, enslaved etc. Why would any person want to purchase and read a light novel series like this one?