Oshi ga Tonari de Jugyou ni Shuuchuu Dekinai!

Chiro-chan is a world-class idol...at least, to Sakiko Manaka, your run-of-the-mill hard-core idol fan. So when Chiro—real name Chihiro—ends up sitting next to her in school, Sakiko's world is turned upside-down, and all her brain cells vanish. After all, how can she concentrate when her absolute fav is just inches away?! But she needs to be on her A-game, because she may not be the only one who is totally gaga for Chihiro...
(Source: Kodansha USA)