Hello Zumi, I read your story and the idea and storyline is amazing and I really appreciate it but your story need some corrections to glow up. I some dialogues where you want to show excitement and amazement, you should use exclamation mark (!) and in inner dialogues of character and expressions you should use different fonts so that it will be clear to readers.
For example:-
You worte:
Nobita p.o.v.
In restroom
Started to cry
Why shizuka you always take his side.
I know he is smart intelligent but you and I are together since childhood.
Still you favour him started to cry more
After 15 min of crying he goes back to class but unfortunately teacher was there
Sir-wow nobita you never came school on time but today you did but bunked my class shame on you
It should be:
Nobita's p.o.v.
In restroom..
He started to cry.
'Why Shizuka you always take his side?'
'I know he is smart and intelligent but you and I are together since childhood.'
He cried harder.
'Still you favour him....'
He cried more and more. After fifteen minutes of crying, he wiped his face and went back to his class. But unfortunately, teacher was there.
Teacher: Wow, Nobita! You never come to school on time, but today you did— only to bunk my class? Shame on you!
You can also try to add expression more so that readers can imagine it.