God this is lame, It's a lazy spin on the main character gets reborn as a monster genre without any of the time spent on world building or fleshing out the system every character uses.
Everything has stats but massively simplified in that it only shows level, HP, MP, skill, and rank. Levels seemingly don't matter beyond bigger number = better, hp and mp are similar, rank is completely arbitrary and doesn't mean anything, and skills are completely static without levels or grades or even explanations.
It's all thrown together so carelessly because it's just copying the already successful contemporaries, the characters themselves are just templates.
You've got the wimpy main character who refuses to kill people even though he's constantly being shit on, the annoying little sister who treats the mc like a bug, but she's secretly worried about him so it's "cute" and that somehow makes it okay, the common party members that betray people at the drop of a hat for basically no reason, the pure damsel in distress who always makes things worse, the evil for evil's sake bad guys, it's got it all.
Back to stats, the characters supposedly get stronger with every level, but the only stats that we see increase are HP, and MP, if you're going to go the rpg route with levels and everything why would you stop there? Some characters can seemingly use advanced versions of their skill like ice bolt -> ice lance, or sword beam into sword cross, but it's not explained how they can do this and it's never shown in their status board.
Anyway, if you're going to give this a read, don't expect it to respect your time, because it's just a shitty knock off at the end of the day.