The One I like Is My Sister but Not My Sister - Vol. 4 Ch. 20 - No matter what it takes, I will become Towano Chikai. (5)

[MangaDex]

 

[Siquall]

Mai is awful since the beginning.

This story would be better without her.

 

[Mindself]

Mai is just an ungrateful/spoiled brat
you cant always blame someone else for your failures, you gotta overcome them by yourself.
Author thinks everybody will go forgive her because shes ''cute'' but if you're like that irl you're a piece of shit.