Inventive Princess

From Manga Abyss:

Super genius inventor Shizuka, a.k.a. the walking National Treasure, fell in love at first sight with Hajime-kun when she was 10 years old. She hasn't stopped pursuing him for 6 years! Every day, she worked hard to invent something that will get Hajime-kun to fall in love with her. Will she ever be able to win Hajime-kun's heart?