Both movies are about a boy how make the main Girl his slave.
Both Romcom movies with alot of funny scenes.
After finish The Black devil and the white prince. 100 Days with mr. Arrogant was the First Movie that came upon in my mind that relatable to it. The only Differents is that in The black devil and the White prince they have a love triangle and this don't happend in 100 Days with mr. Arrogant. Be I'm sure if you love one of them you also love the other.

I watch both live action movie and they are really look a like to me. Both in Kimi ni Todoke and in My love story both have a cute love story and they also have a cute couple you really want to come together. Both have drama in it and both are so cute and heartwarming to watch