The hit light novel series written by Tsukasa Fushimi and illustrated by Hiro Kanzaki Eromanga-Sensei has passed 1,600,000 sales, the light novel series also received a TV anime adaptation in Spring of 2017 and was animated by A-1 Pictures, who also did the animation for the TV anime Sword Art Online, Your Lie In April and many more.
Tsukasa Fushimi is also known for his other hit light novel series Ore no Imouto ga Konnani Kawaii Wake ga Nai or My Little Sister Can’t Be This Cute, the light novel also received a TV anime adaptation in Fall of 2010.
As a bonus, ClariS a Japanese Pop duo performed the openings for both anime Ore no Imouto ga Konnani Kawaii Wake ga Nai and Eromanga-Sensei who also did the opening for Mahou Shoujo Madoka Magica, ending theme for the Monogatari series and many more.
Source: Oreimo and Eromanga Joint Official Japanese Twitter Account