Responses

"But if you are 10 years old, only do things a 10 year old would do" refer to chapter 4 or 5. Also, this is a different story from others. Thinking they're a "prodigy" is unnecessary when she has no major role (et: Lead or Villainess) She's destined to die during the early to medium stages of the story. Her pretending to not be immature works, seeing as how you're holding her against it. Also he thought process is childish?????????? He's maure 'cause he also went back in time, why do you think his attitude towards their relatiomnship changed?
But she's damn near 40 acting like this? Damn she's annoying