Ep 1. My Little Sister, and the Sealed Room

Eromanga Sensei season 1 episode 1 is titled "My Little Sister and the Sealed Room". The episode introduces us to Masamune Izumi, a high school student who is an aspiring light novel author. Masamune's little sister, Sagiri, is a hikikomori and has been isolated in her room for a year. Masamune takes care of her and is the only one in their family who looks after her.

Masamune has never seen his sister's face as she always wears a hooded sweatshirt and hides her face from everyone. He communicates with her through a messenger app and they work together to write light novels under the pen name "Eromanga Sensei". Eromanga Sensei is an anonymous illustrator who provides Masamune's novels with grotesque and erotic illustrations.

Masamune receives an email from his editor that motivates him to write a new novel. However, he realizes that he needs a new idea for his novel and decides to visit the library for inspiration. While he is in the library, he meets a famous illustrator, who goes by the name "Elf Yamada". Elf is amazed by Masamune's work and offers to collaborate with him, but Masamune refuses as he prefers to work alone.

Later, when Masamune returns home, Sagiri asks him to help her with some errands. She wants him to go to the store to buy some snacks and a new game for her. While Masamune is out, Sagiri discovers something that she should never have seen. This discovery leads to an argument between the siblings and Masamune locks Sagiri in her room.

Masamune starts to work on his light novel but is unable to concentrate because of his guilt over locking Sagiri in her room. Meanwhile, Elf continues to pursue Masamune and even visits his house. While Elf is there, Sagiri gets curious and peeks out of her room to see what is happening.

The episode ends with Sagiri watching Masamune and Elf together and feeling jealous and hurt. She changes her mind about cooperating with Masamune on their light novel and tells him that she won't do illustrations for him anymore. Masamune is left to contemplate his actions and the consequences of hiding things from his sister.

In conclusion, Eromanga Sensei season 1 episode 1 introduces us to the dynamic between Masamune and Sagiri and sets up the premise for the rest of the series. The episode is an interesting introduction to the world of light novel authors and illustrators and the pressure they face to produce content. It also explores the themes of sibling relationships, guilt, and jealousy. Overall, it is an engaging and compelling episode that leaves a lot of room for character development and plot progression.