'A Sister's All You Need' starts out as a full blown ecchi siscon anime and about halfway through turns into a board game advertisement show with slice of life elements and occasional ecchi moments, which vary from light perverse humor to a full on yuri groping session.
Despite what the title promises, there is no little sister, only a protagonist who is obsessed with his ideal fantasies of them.
Hashima Itsuki is a young 20-something year old established light novel writer working on his career from his one room apartment. He is friends with a couple of other authors whom he hangs out with, along with a friend from high school and his step brother who visits frequently and helps cook and clean.
Itsuki is an unapologetic siscon who obsesses over the concept of the perfect little sister and tries to implement it into his writing. Meanwhile people of the fairer sex have their eye on him.
There are references to other sister related entertainment such as Oreimo and Eromanga Sensei, though this title is written by a different author.
The progression of the story is odd. It starts out hard with a very spicy opening scene of a naked little sister straddling her brother, which of course turns out to be an imagining of a story Itsuki has written, and then turns into a slice of life show about Itsuki and his friends and how they experience starting from light novel authors and moving up on to manga and anime based on their novels.
This part of the show is actually pretty interesting, even if it's mostly skin deep and glosses over almost all the detail.
There's a half-way harem theme going on but the show never really goes anywhere with it, as this season is largely a setup for another.
Curiously the show turns into a board game advertisement across multiple episodes and I have to wonder if this was a requirement for the anime to be made. By the last episode this content has definitely overstayed its welcome, but all the games are interesting and related to the anime, in the form of story telling and being in the industry.
The main cast is interesting, you have the head-over-heels girl Nayuta who is overtly in love with Itsuki, who keeps trying despite his initial rejection, who also happens to be a top selling author.
Then you have Itsuki's friend Miyaki from highschool who hangs with the group as the 'straight woman' character with her own doubts and wishes. The other male character Fuwa is another author who is in between Itsuki and Nayuta in terms of success who struggles with his own brand of writing and disappointing successes, obsessing over how his works are perceived.
Finally there's Itsuki's step brother who there is absolutely nothing suspicious about.
All of them have their stories and are focused on well enough. It's a light hearted show with practically no drama or misunderstandings which is to the show's benefit.
It's a decent comedy/slice of life/ecchi show with some genuinely funny moments. It's not a big production, but it does have a nice outro :)
