Beloved X Survival

Aoi Tanaka, a lonely child of a single father moves to a new house of her Stepmother's family, where 13 brothers awaited for her, 13 very unknown, different strangers, and somehow all of them are now in conflict to win her heart. Aoi's heart is torn between the vows of sisterhood and lover, among thirteen who would be the lucky one? slight AU, reverse-harem, partial-incest.