Oneesan to Joshikousei

"Please don't tell anyone about me!"
Akira Takanashi, a dry girl, has discovered a secret.
The cool and beautiful prince of the school, Yoichi Oribe, is a "onee" (onee).

He is good at making sweets, is always on high spirits, and loves girls...?
This is a love comedy between a tsundere onee boy and a fast-paced girl!