The writing quality of the story is good, although there are some mistakes. I would rate it 4 stars ⭐.
In terms of story development, there is too much romance. While I understand that it falls under the slice-of-life genre, since the author included an action tag, there should be a balance between romance and action. As it stands, the excessive romance makes it boring for me, so I would rate it 3 stars ⭐.
The characters are well-designed, especially the main character (MC). He is calm, smart, and respected. However, there are instances where he goes overboard with his romance/love for Mitsuri. For example, when he says, "I don't want other people to see your smile," it comes across as possessive. Despite this, I still like the characters, so I would rate it 4 stars ⭐.
The world background is well-developed, and the author has put effort into providing detailed descriptions. I would rate it 5 stars ⭐.
Updating Stability: ⭐⭐⭐⭐⭐ (5 stars)
Regarding the updating stability, it should be noted that the updates for this fanfic are slow. However, considering that it is a fanfiction and provided to readers for free, I would still give it a 5-star rating. The author's efforts and dedication to continuing the story despite the slow updates deserve appreciation.
In summary, I enjoy the story overall, but the heavy focus on slice-of-life elements and excessive romance make it boring for me at times. The pacing can also be inconsistent, with moments of slow and fast pace. Since it's only 13 chapters long, I will reserve my final judgment until it reaches 30 chapters, at which point I will provide another review.