Asuka Ima

The younger sister of Mirai. Ima specializes using a bow-and-arrow.
Mostly appears in Mare's Route in Eternal Heart.
She was sent back to Hibarigasaki in order to return Kosame to the stars, but after discovering both Ren and Mare, she decides to deal with them too.
Her memories have been wiped out and thus, she can't remember anything about her family or older brother. She is mentioned in the first game when her brother tells that she suddenly disappeared.