From Now on, You're My Demon

After losing both her parents and her grandmother who took her in,
Hina is afemale highschool student who became orphaned
Stricken with grief after becoming all alone,
"I won't pass away until I've seen you in your wedding dress, Hina."
she remembered what her grandmother told her
she headed to the church during the last night of her grandmother's funeral...
"I don't want to be alone anymore."
While those thoughts crossed her mind, a bell rang.
In that moment as she spoke her vows before her grandmother's coffin,
a man suddenly appeared in front of her?!