>>280902234
He always starts up his own magic research laboratory in the later loops
>>280902423
Yes. She is "Choroine" that is literally whay the Web Novel called them. The English manga translation had them painted as just crazy.

Basically "Choroine" is a Japanese meme of girls who easily fall in love with guys who show them even just a bit of kindness even if they treated them like absolute shit previously. Kaori from Arifureta is another example of a Choroine girl.