We vampires do not have reasons to entangle our destinies with others'.The young older sister, quickly and certainly, had to teach her mentally unstable sister not to use her power.Our powers have grown stronger as well.There will no longer be anywhere that will accept us.When she did use it, she would display violence.
Rrrrrh...
She could only become a target of fear for the younger sister.They did this because she was mentally unstable, perhaps because her power was too great.In the end, she could only come in contact with her blood relative not as an elder sister, but as a "chock" on her younger sister's ability.But if you destroy this place we have finally drifted to...We have both grown taller, haven't we?You are about strong enough to destroy Gensokyo now...