read it here http://www.onemanga.com/Chocolate_Cosmos/
plot summary
Sakurai Sayuki was born with sharp eyes that make her look like she's always angry, even though she's not. Because of her looks, students around her misunderstand her as a bully and scary girl when in fact she's "a romantic". After 15 years without a boyfriend, she started off her high school year with hopes of love...