!SPOILER!
If you look at the story plot description on the page it's clear that the MC is not well. The prologue is mostly focused on the events surrounding the MC and only very superficially touches on the MC's inner thoughts and emotions, but I try to go into what reason(s) he might have for not sending Mikiko away (she is a typical Tsundere character who is slowly becoming more relatable to the MC), which is clearly stated at the end of the prologue. And why the MC goes along with all this will be revealed more clearly in the next update. My aim with the prologue is to set the scene for the story to get going.
As for the English language bugs, English is not my first language but they will be fixed by the time the android version is released on Sunday.
Thanks for your feedback on the game I really appreciate it.