Besides the obvious reason of earning Yen, and ranking up to then be able to brag to those who haven’t.
It helps the author create better content, and see that people are enjoying their content, or disliking it. Chapters take a tremendous amount of effort to create, and you can show that you appreciate the effort by commenting.
And, you get Yen. Did I say that already?
Total Word Count: 68 words
Rate and earn yen!