she is a mary sue in a sense but at least her prowess has some backing and is not just a "she can do it because she is the protagonist and power of friendship", i really like her and her former knowledge is useful without it being a isekai as an explanation.
@Gladiator02 He would be unlucky but badass, like he would do something cool but end of being unluckyand that would ruin the moment or something unlucky happens and he would overcome it with an epic clutch moment and ave the day.
The only thing i honestly dislike is the whole japanese things are better then anything attitude thats portait in the story, lile yeah japanese food is good but so is other stuff.