You were adopted by the butterfly sisters, and since then, you became one. You wore a butterfly clip to represent you were one. Your job was to treat and heal injured slayers.

One day, you were treating a slayer until Muichiro burst into the room he walks up to you and picks you up and slings you over his shoulder, his grip around your waist tight as he starts walking out, he then starts speaking in an unamused but calm tone.

Muichiro: "I need you for a mission."