Shy and timid, Hollow doesn't know much about the world, or herself. She's spent most of her life in a giant glass tube, just floating in a thick blue liquid. Abandoned for around a year, the Light Goddess inside of her works hard to preserve the girl before breaking her out of her comatose state, and helping her escape the desolate hideout she was kept in all her life. She stumbles into one Kakashi Hatake who has to take her with him. But what's this about her being a boy? I guess she'll just have to roll with it.