Her teens with short, blond hair and medium sized breasts extremely powerful Witch can.
She didn't want to repeat this and make her son go through the same thing her daughter went through, but she didn't know what else to do.
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Rena reflects on her parents' divorce and concludes that she did not try hard enough to stop the divorce and that some people are not deserving of kindness.
Ryukishi could have brought this story turn around with a little more aptitude.