I Will Start the Contract Family From Today

From Gourmet Scans:
Hinako, a high schooler, is left alone without any relatives to take care of her after she lost her beloved mother.
Overcome with sadness, she agrees to be a live-in employee at the handsome CEO Yukihito's house after a series of events.
To keep up appearances, Hinako ends up getting married to Yukihito... but he actually has 4 children?!!
A heartfelt story about a couple with a complicated past, along with their children’s strong personalities.