Eromanga Sensei

One year ago, Sagiri Izumi became step-siblings with Masamune Izumi. But the sudden death of their parents tears their new family apart, resulting in Sagiri becoming a shut-in which cut her off from her brother and society. While caring for what's left of his family, Masamune earns a living as a published light novel author with one small problem: he's never actually met his acclaimed illustrator, Eromanga-sensei, infamous for drawing the most lewd erotica. Through an embarrassing chain of events, he learns that his very own little sister was his partner the whole time! As new characters and challenges appear, Masamune and Sagiri must now face the light novel industry together. Source MyAnimeList