Masamune Izumi lives a very interesting life as a light novel author who still is a high school student. Teamed up with the legendary Eromanga-sensei, the never before seen artist, Masamune’s works are propelled forward becoming quite popular and showing he has a bright future in the literature world. Oddly enough though, Even Masamune has never seen his partner Eromanga-sensei, similarly like how Masamune barely sees his shut-in sister, Sagiri. Then one day during an Eromanga-sensei live stream Masumune notices something in Eromanga sensei’s room and realizes who the legendary artist unknown to all truly is, Eromanga sensei is actually Masumune sister Sagiri! The odd sibling romance story begins properly here and oh what an odd love story it truly is.

Aiz Wallenstein known as the sword princess, once again heads to the dungeon alongside her faithful party. Their goal like many others is to conquer the dungeon a feat no man or woman has accomplished so far. As they go further into the odd labyrinth like dungeon, they begin to notice more and more strange occurrences. For Aiz and her team, it seems like something is getting closer to them. Nonetheless Aiz is unfazed and continues on into the depths of the dungeon. Then suddenly she meets a young boy named Bell and Aiz will realize that besides the sword, she will have something else on her mind now.