Both have a high school girl as the main character who is a bit of a tomboy. The main character is involved in a love triangle. Both main characters fall in love and pretend they're not, which makes them both funny and romantic.
Sachie Wakamura's mother has just passed away, making her an orphan. Suddenly, a man claiming to be her grandfather appears asking Sachie to live with him. Things aren't as simple as they seem to be when she realizes her grandfather is the boss of a yakuza gang and she is to live with him and the rest of his men. To make matters worse she is assigned a bodyguard named Rakuto, who is the handsome, popular student council president at her new school. Sachie must now try to fit in with her new family and deal with her developing feelings for Rakuto, who appears to only see her as the granddaughter of his boss. Are Sachie and Rakuto destined to continue in this master-servant relationship forever or will her feelings finally be reciprocated?
Both have girl main characters who lost their mother. As the story progresses both girls learn about their mothers. Both main characters fall in love but hide it. Both are funny and romantic. I'd say if you liked wild one's you will like wild act. But wild act isn't for young readers more like early teens +.