Masamune Izumi is a light novel author in high school. His artist, known only as "Eromanga Sensei" is reliable but Masamune has never met him and assumes he's just a perverted otaku. Masamune's little sister is Sagiri, a shut-in girl who hasn't left her room for an entire year. She even forces her brother to make and bring her meals when she stomps the floor. Masamune wants his sister to leave her room, because the two of them are each other's only family.
One day Masamune discovers that Eromanga Sensei and Sagiri are one in the same. Further chaos erupts between the siblings when a beautiful, female, best-selling shōjo manga creator becomes their rival.
Takeru continues his education at Tenbi Academy as part of the newly formed Security Committee. As a team with the other members they battle unscrupulous individuals who use their Maken for evil purposes. In the meantime, his libido and the conflicting romantic interests of the girls surrounding him complicate matters considerably.
Sword princess Aiz Wallenstein. Today, once again, the strongest female swordsman heads to the giant labyrinth known as the "Dungeon" along with her allies. On the 50th floor where mysteries and threats such as a decayed dragon's corpse that crumbles to ash and an irregularity that creeps ever closer to the party loom, Aiz calls for the wind and heads deeper into the darkness of the Dungeon. Eventually, she finds herself meeting a boy for the first time. "Um, are you OK?" In the Labyrinth City of Orario, the contrasting stories of the boy and the girl intersect!