She's Kids!

Shizuka, age 17, was raised by her mother, and the two are very close. However, the store her mom's worked hard to maintain was swindled by the Sakurasei Real Estate Company.
Shizuka then, pretending to be the new wife of the president of Sakurasei, enters the Sakurasei family home while the president is away on business to get back the deed to her mom's store. In an instant she becomes "mom" to three boys, and the eldest son Kanon is the same age as her…