Both have that siscon element and the guy who is a writer for some manga publishing company , the tweak here was that Imouto Sae Ireba is a alternate of eromanga sensei, where the onichan does have a siscon disorder.
Eromanga-sensei is an anime that became a "success" of last year and won many viewers even though I did not particularly like it, Imouto sae ireba Ii has similarities with Eromanga-sensei, beginning with the protagonists, both are writers of Light Novel and participate in publishers , in both animes the protagonist has a sister, in both animes there are many characters being presented and who become friends of the protagonist, watch Imouto sae ireba Ii, is better than Eromanga-sensei.
Both series detail stories including authors and editors, and are rather similar in the key aspects. Both also somewhat act as comedies, and detail the lives of light novel writers that have or are trying to debut.
Both have a main character trying his best to stand out at least as much as their love interest. Imouto Sae Ireba Ii's protagonist even feels like someone who has gone through everything the main chartacter of Sakurasou no Pet na Kanojo has
Written by the same author and you can tell this is the series he really wanted to make. If you liked the imaginary sequences of Haganai, this show delivers more of those fantasies on a consistent basis, driven by more mature and emotionally complex characters.
Occasionally sentimental comedies revolving around anime, manga, and light novels as a profession. Many aspects of the industry are explored thoroughly, such as "generic" light novels and their adaptations still being born from a place of passion for the medium, and what it takes to go from being a consumer to a creator.
- Both has main character with strange obsession (in Mangaka-san MC is obsessed with panties, in Imouto - he loves little sisters)
- MstAs is about mangaka and his friends and IsIi is about novelist and his friends
- Both are pretty lewd but in the funny way
- You can expect fanservice which is not taken seriously from both
Toradora & Imouto sae both contain the same "Scrubs" - style formula (the irl comedy, occasional emotional doctors show). Namely, they're a) character driven b) part 1 of episode of characters interacting/doing trivial things c) part 2 of episode containing the "feels" / life lesson.
a large lesson that is constantly revisited is that of "taking something for granted" whether it be a talent, a personality, a relationship, etc. consequently, each of these shows also delves into when those characters does take something for granted and how it affects the rest of the cast.