Kakuriyo: Bed and Breakfast for Spirts

Plot: Aoi's older brother Aiko is abducted with her by the Master Innkeeper.

His name is Aiko Tsubaki. Technically he is Aoi's paternal cousin, but they grew up together, both raised by Shiro. He has bright blonde hair, deep blue eyes, ghostly pale skin. He is allergic to natural lighting.