Main character, Geo Margilus, a reincarnated Japanese man that is brought to this world (region of Sedia) after his death. Story is lacking real objectives to achieve. Geo, main character, helps out a damsel in distress (Elisabel Roney Filsandia), that is being hunted down by her Dad and her family. Main character and his group become entangled in the politics, corruption and depravity of some territories by the Sea.
The Demon Lord becomes active, so main character tries to train as many students into becoming strong magic users. Because Geo is so Over Powered (OP) in his magical powers, adversaries try to blame and discredit him.
It took the author a year to publish this third volume. This third volume has 200+ pages, with 14 chapters. On average, each chapter has about 15 pages. So it is above average in story development and details. Main character has no real commitment to save the different territories of this Sedia region. Especially now that most are trying to tie him to the Demon Lord. Others try to assassinate Geo or damage his retinue-harem-group. The religious groups do not want to cede power, and thus are trying to control or remove main character from this other world.
Story is weak and rather flat. Harem-like-retinue is still passive (no abuse of power, sexual pressure, etc.) Although the author accentuates beauty of the girl characters in this novel series, fortunately, the main character continues to look but not touch.
The author in a moment of creating filler content, makes retinue and main character play board games. I know that Dungeons and Braves is a Table-Top Role Playing Game, but a game-like isekai-fantasy novel volume playing games as part of the story is somewhat redundant.
From the action and adventure that were common in the first and second volume, this third volume writes about themes that are complicated and convoluted (religion, corruption, defamation, depravity.)