He sets out to work at the academy to cultivate the protagonist and their party to prevent the world's ruin. Yet, he quickly pivots to wanting to aid all the dropout students for... principles? Sure, that's totally fine. But when the author was trying to represent the protagonist as a "realist" and then pivots to being a "visionary" in a paragraph, it feels genuinely awkward. I think the only reason it isn't as harsh as it could be is because the protagonist's personality is left so undefined that there is less cognitive dissonance when the protagonist does things that are strange.

The second, game-breaker scene is when he kisses the fiancee of his host body out of nowhere and it's implied that he loves her.... Really? He loves the woman he had no idea about what he did to her until a few hours prior? Maybe, just maybe, it's a misdirect. But as someone who dislikes misdirection, I have no interest in continuing further.

Bear in mind, the protagonist said the chapter before this arc came that he didn't care for her aside from doing the quest. The next chapter, he is already fawning over her and trying to take care of her in his "tsundere" way.

For example, it's stated and suggested throughout the story that he has spent a significant amount of time in this new life in the demon world. Yet, not once has he investigated the history of the body he now inhabits nor delved into his relationship with the host body's fiancee.

However, it was suggested when he was fighting two servants of said fiancee that he did not want to hurt her feelings by killing them both. That would imply a level of understanding of who she is, that is suddenly absent when the plot demands it to be so for the sake of there being a "shocking revelation" that the host had caused the fiancee's suffering.