Even though the author is quite fond of projecting his primal instincts in the manga, the wholesomeness kept it in check. Any less diabetes this manga has to offer would have resulted of the cluster fuck of a fan service Fairy Tail went through. Though it may seem like the mc was like the classic beta pussy for a while, the author somehow made it believable. (like how Araki made Kira a good villain no matter how absurd his intentions are) And even though the development was quite wanky especially after 1rst cosplay, it was never actually out of place and is quite reasonable.
However, slice of life mangas tend to become boring and downright repetitive and this manga didn't escape it at all. But the apparent yet slow development and the fan service is what this manga is good and is probably it's bread and butter. I only hope that the author won't do anything stupid like the one with the fetish couple did on their second season.