Zero is a 15-year-old girl who's past is clouded with multiple hardships. After losing her family, she practically isolated herself from everyone. Things take a drastic turn when she's adopted by a merry couple that introduces her to their thirteen sons and one daughter. Her life takes unexpected turns as she becomes part of the Asahina Household. Many of the things she thought she knew wound up being more complicated than she anticipated. Join the hectic life of Zero.