Bitter Prince

Hana is a energetic girl who wants a part time job so she can spend the money playing with her friends, but because of this nobody wants to hire her. Until the popular Satsuki offers her a job at the coffee where his brother, a super grumpy handsome guy is the manager. Blinded by the cool and kind Satsuki and besides his brother being against it, she ends up taking the job. But then Satsuki's personality changes completely!!

(Source: Otakumole)

Note: Included one-shot "Natsu-iro Kujira (Summer Colored Whale)".