Coochi-Coochi-Coo! Stop Tickling Me!

From ComicWalker: Ogura Saki is a lone-wolf yankee determined to make a name for herself in high school, until Oguri Yuka, the class sweetheart, keeps getting in her face. Saki thinks Yuka is irritating, but a chance incident reveals Saki’s secret: she’s terribly ticklish.