A Sister's All You Need. Season 1 Episode 1 I Only Need a Little Brother Who Can Cook, a Beautiful Naked Girl, and Friends I Can Relate To.

As a light novel author, Itsuki Hashima spends much of his time confined to his room, crafting fantastical stories that he hopes will capture the hearts of readers around the world. But despite his success as a writer, Itsuki is a bit of a recluse, often going days without interacting with anyone besides his small circle of friends.

That changes one day when Itsuki's little sister, Chihiro, shows up unexpectedly at his doorstep. Though the siblings haven't seen each other in years, Chihiro has always harbored a deep admiration for her older brother, and she's determined to make up for lost time.

It doesn't take long for Chihiro to notice that Itsuki's apartment is a bit…sparse, to say the least. So she sets out to remedy that, starting with the kitchen. Itsuki has always been a picky eater, so Chihiro devotes herself to mastering new recipes that will please her brother's palate.

But food isn't the only thing Itsuki needs in his life. As a writer, he's constantly on the lookout for inspiration, and there's one thing that he's always been drawn to: beautiful, naked girls. So when one of Itsuki's friends brings over a stunning model for a photoshoot, Itsuki is beside himself with excitement.

Of course, that excitement is tempered somewhat by the fact that Itsuki has no real experience interacting with women. Fortunately, Chihiro has no such qualms, and she quickly strikes up a friendship with the model, Nayuta.

As the episode continues, Itsuki's world begins to expand in new and unexpected ways. He reconnects with some old friends, meets new ones, and even starts to think about finding love for himself. It's a journey that will take him to some unexpected places, but with Chihiro by his side, he's ready for whatever comes his way.