There's a lot of suspension of disbelief on this series.
First off, the shounen aspect of this series is the typical MC that supposedly has a lot of potential to become strong. However, every fight is just himself getting beat up to near death state. You know, it's the typical lip service "I will defeat you despite not being able to do anything but I won't give up." Then somehow near the end, he either gets saved by a girl or yell really loud to defeat his opponent. Yeah, you can just yell really loud to power up. Rinse and repeat for every fight.
Second, there's a lot of ecchi. The male MC is the typical pervert that lusts for the silliest of female exposure. However, when the female is willing to let him "peak" for some fan service, he becomes shy and rejects all advances. Uh, what's the point of going after females if you're just going to reject at the last minute??
Third, a lot of the explanations for what's happening with the youkai or his "potential power" is just boring. No matter what is said, it just boils down to the mangaka concluding similar to "just believe my bullshit because I say so." So there's really nothing interesting reading the explanation nor watching the battle because it's all the same at the end. If you watch the first battle, it's the same every other battles.
It was funny for the first few chapters but now it's just boring and very predictable. The only redeeming points were the premise and the pretty art.