Ojou To Banken-Kun

Briefly about Ojou To Banken-Kun manga:

The story centers around Isaku Senagaki, a newly admitted student at Hakushin Girls' High School. Her grandfather is the group leader of a large yakuza organization. Her childhood friend Matsuhiro Kusumi, nicknamed Banken by others, becomes her classmate without her knowledge. Banken himself is an intimidating person with a strong sixth sense. When Isaku learns about his true colors and Banken saves her from a crisis, she decides that she will herself confess to him so that they can be together.