Over 200,000 copies sold!! (Including digital) The gentle gap just won't stop! This book includes more than 30 pages of exclusive illustrations! 《Synopsis》 In the main family, Kōzō, the illegitimate child, Miya, starts a new life. Surrounded by her stepmother Teru and her stepsisters Marika and Arisa, she experiences her first time babysitting at a department store, and a new young lady makes her appearance. There are still so many things she's not used to――!?