[cyberdemon]

here's an idea:

Spoiler for 91:

maybe Akasha's family is the keepers of Alucard. When they come in contact with him they are given some sort of abilities which would explain Touhou Fuhai saying she had a terrible destiny. Akasha knew that FT wanted Arucard to use as their own but knew they couldn't control him. She could stand up for herself because she was a dark lord but by having Moka come into contact with it she came to possess the same ability. Akasha panicked knowing that FT would try and use Moka for their incidious plot so she changed the rosario to block off that power and then sent Moka as far away as possible to keep her out of their hands.

by the way, one other thing:

Spoiler for 91:

do Japanese wives usually address their husbands with -san? Akasha called Issa, Issa-san. Considering how old Moka is it seems wierd that she'd still adress Moka's father with san.