Duel!

Duel! is a seinen manga series by Rintarou Asahi. It was serialized in Young Gangan.

Plot
Minori's motto in life has always been to smile, no matter the hardship. However, her sweet personality, in an attempt to make friends, has led to constant bullying and being taken advantage of. Pushed to her breaking point, Minori begins to give in to peer pressure until she is saved by a beautiful girl named Alice.