I stopped reading at Chapter 105 because the main character reached a point where I found his progress overwhelming. Here's an excerpt starting from Chapter 50 of the web novel:
From the beginning, I understand why Rio was treated poorly despite saving the second princess. As a politically imprisoned individual with limited education and power, he lacks understanding of the various types of magic present, which can happen in real-life situations. Additionally, not disclosing his true identity to his childhood friend, Haruto, is understandable due to his nervousness and fear of burdening her with the truth. However, his excessive adoration towards her becomes creepy.
Despite this, Rio's behavior is far from typical masculinity. He fails to clarify misunderstandings, displays excessive humility, doesn't utilize his newfound background knowledge to his advantage, and is indecisive when it comes to women who have feelings for him. The supporting characters also contribute little to the plot.
A crucial moment occurs when Rio, posing as Haruto, saves Miharu. When she recognizes his name, he should seize the opportunity to clear things up, but instead, he gives a nonsensical response. Discovering he's a prince, he allows lower nobles to mistreat him abroad without leveraging his royal status or mentioning his connection to the Yagumo region's king.
Throughout the story, Rio showcases exceptional skills, yet he downplays his accomplishments with self-deprecating comments, which can come across as disrespectful. His physical appearance and talents attract numerous admirers, but he doesn't address these dynamics. His obsession with Miharu intensifies, leading him to rescue Celia from a forced marriage, yet he chooses to ignore her and focus on talking to Miharu and another female character, Satsuki.
In the light novel adaptation, Rio's character behaves more like a typical guy, albeit with retained denseness but less than in the web novel. This slight improvement offers a different dynamic.
In summary, the main character's lack of assertiveness, communication skills, and decision-making in the web novel create a frustrating reading experience, but the light novel provides a slightly more balanced portrayal.