The 3 heroes all died during their previous life because of their bad personalities.
Being reincarnated with superpowers certainly didn't help.
As long they think they are invincible they will cause countless victims everywhere
That's the why. He found out a easy way to make money and used his broken niece to do it.
Now that he doesn't need her anymore he discarded her like a used tissue
The time loop skill was hers originally, and when he released her the second time her other personality still remembers it.
Once her seal is broken it remains broken even if he rewinds time.
"0 becomes 1, 1 becomes 2, 2 becomes 10, 10 becomes 100.
Taking all back to 1 solves nothing.
So long as 0 remains, 1 will eventually grow to 100 again"
Victims of rape falling in love with their rapist is classic Jap trope.
I'm talking in general with all the people here wishing their were the protagonist.
Being bullied and raped by my bullies certainly wasn't on my list in highschool
When Mei looked at the photo of her past, we can see an adult behind her touching her shoulders (the mother probably).
Their parents are probably the classic "I work far for home 50 weeks every year"