The story is about a wealthy family called "Mitarai Family" running a hospital business and their mother got blamed for burning the house down. But actually, their mother is not the real culprit. After that incident, their mother got sick and their father got married again with their mother's best friend. The kids know that their mother is not the culprit of burning the house so after 13 years later they manage to search the evidence and that's how their journey begins.

*Plot twist on last episode :)