Unlike other reincarnation novels, the MC of this one is 23 years old when the story starts. He has a very realistic view of romance, considering he already lived passed his 40s in his previous life, so don't expect loli heroines that ruin so many other reincarnation stories.
The first 30 chapters are mostly flashbacks of the 'past 10 years' since her reincarnated, and overly wordy setting descriptions. You have to give him credit for the flashbacks though, showing a heart wrenching romance, his life, as a student then teacher, and introductions to his goofy mercenary and other buddies who he gathers with at the local tavern. The "plot" only really begins around chapter 40.
And seriously - the author writes an arc about him getting a secretary pretty much just so he f*cks her whenever he wants, or as the author summarised himself: "when there's work, he gives it to the secretary to do, when there's nothing, he does the secretary" (I quote.)
And it doesn't end there, whether it's being r*ped by barbarian women because they are in heat because of his big pe**s (yes, the author likes to talk about that) or the three sisters who fall into his bed, and many more... possibly not impossible, but totally author's fantasy moments, these all detract from the otherwise gritty features of the novel.