Eromanga Sensei is an anime made from the same producer of Ore no Imouto wa konna ni kawaii wake ga nai(The story also about brother and sister go check it out if you interested)
I want to say that this anime is not that bad.
It's about big brother Masamune who is a LN Author and her little sister who is known as "Eromanga Sensei" AKA Sagiri and other LN Author.Such as Yamada Elf and Senju Muramasa.
I think their personality is kinda same as Oreimo characters.I guess :/
Overall this anime is kinda great for me.I like sibilings kind of anime :v
