Inkya no Ore ga Sekigae de S-kyuu Bishoujo ni Kakomaretara Himitsu no Kankei ga Hajimatta.

*My peaceful school life... is officially over.* Izumiya Ryouta, an introverted otaku, suddenly finds himself surrounded by the top three beauties of the class after a seat change. In front of him sits the little-sister-type Miyama Airi. To his left, the cool and detached gyaru, Ichinose Yuria. And to his right, the refined, black-haired class rep, Kuroki Ruri. On the surface, they're flawless beauties—but Ryouta stumbles upon secrets that none of them can ever let out... *"P-Please...! Just don't tell anyone about this!"* *"From now on, we're in that kind of relationship."* *"This is a secret... just between you and me, Ryouta-kun."* All he wanted was a quiet otaku life—so how did things end up like this?! Caught between three troublesome girls, an introverted otaku desperately fights to avoid any more chaos in this love-comedy showdown! (Source: Kadokawa, translated)