In my opinion, this anime is very good starting from the storyline, good characters and decent graphics. Tells the story of the MC who suddenly turns into a child again and takes revenge on people who have underestimated him as a child.
Unfortunately in the anime there are only 2 episodes so we can't see the MC revenge in the next eps. But in the manga, the story "Gaki ni modotte yarinaoshi", the story is more complete than the anime, more characters appear, more the story of the MC and the ending, which I think is quite surprising.
I also learned a lesson from this anime, grudges that last too long will make our lives uneasy and our lives can get messy.
This is my favorite h anime because it has an interesting storyline and characters that i like.