The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat - Recommendations

Alt title: Sekai Saikyou no Assassin, Isekai Kizoku ni Tensei suru

If you're looking for anime similar to The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat, you might like these titles.

Ascendance of a Bookworm OVA

Ascendance of a Bookworm OVA

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Ascendance of a Bookworm: Part III

Ascendance of a Bookworm: Part II

Ascendance of a Bookworm: Part II

With her baptism ceremony complete, Myne begins work in the temple as an apprentice shrine maiden. Awaiting within is what she always wanted: a room full of books! But her new life isn't quite the dream she was hoping for; she's surrounded by nobles who scorn her commoner origins, and even her own servants are causing her trouble. On top of that, she has to constantly battle the weakness of her own body. But with her love for books burning in her heart, she gives her all to her new apprentice duties.

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Ascendance of a Bookworm

Ascendance of a Bookworm

Avid bookworm and college student Motosu Urano ends up dying in an unforeseen accident. This came right after the news that she would finally be able to work as a librarian like she had always dreamed of. When she regained consciousness, she was reborn as Myne, the daughter of a poor soldier. She was in the town of Ehrenfest, which had a harsh class system. But as long as she had books, she didn't really need anything else. However, books were scarce and belonged only to the nobles. But that doesn't stop her, so she makes a decision... "If there aren't any books, I'll just create some."

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Knight's & Magic

Knight's & Magic

A genius programmer and hardcore robot otaku is reborn into a world of knights and magic, where huge robots called Silhouette Knights roar across the land! Now reborn as Ernesti Echevalier, he uses his vast knowledge of machines and programming talents to begin to make his ultimate robot.  But his actions have unexpected results...?! The dreams of a robot otaku will change the world!

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Didn't I Say to Make My Abilities Average in the Next Life?!

Didn't I Say to Make My Abilities Average in the Next Life?!

Kurihara Misato was a little more capable than other high school girls, and as a result, she was always alone and couldn't live her life the way she wanted. When she was reincarnated in another world after a tragic accident, she wanted a chance to make normal friends and live a normal life. So she asked God for one thing... "Give me abilities that are average for that world!" But the abilities God gave her were not "average" at all... And now this girl, who's been reborn in a world where magic is real, struggles to find simple, ordinary happiness!

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My Next Life as a Villainess: All Routes Lead to Doom!

My Next Life as a Villainess: All Routes Lead to Doom!

Wealthy heiress Catarina Claes is hit in the head with a rock and recovers the memories of her past life. It turns out the world she lives in is the world of the game Fortune Lover, an otome game she was obsessed with in her past life... but she's been cast as the villain character who tries to foil the protagonist's romances! The best ending the game has for Catarina is exile, and the worst, death! She'll have to find a way to avoid triggering the flags of doom, and make her own happy future! The misunderstanding-based screwball love comedy now begins!

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The Eminence in Shadow

The Eminence in Shadow

Shadowbrokers are those who go unnoticed, posing as unremarkable people, when in truth, they control everything from behind the scenes. Cid wants to be someone just like that more than anything, and something as insignificant as boring reality isn't going to get in his way! He trains in secret every single night, preparing for his eventual rise to power—only to deny his destiny by a run-of-the-mill (yet deadly) traffic accident. But when he wakes up in another world and suddenly finds himself at the head of an actual secret organization doing battle with evil in the shadows, he'll finally get a chance to act out all of his delusional fantasies! 

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The Master of Ragnarok & Blesser of Einherjar

The Master of Ragnarok & Blesser of Einherjar

Yuuto Suoh is a boy from modern times who accidentally ended up in the warring world of Yggdrasil. In a world where various clans fight for supremacy and survival of the fittest rules supreme, Yuuto managed to use his modern knowledge as a weapon and the age of sixteen, managed to become a Patriarch with a force of thousands. Welcome to an exhilarating battle fantasy chronicle about a young man who became a king in a parallel world and the beautiful battle maidens who swear absolute fealty to him!!

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Re:ZERO -Starting Life in Another World- Season 2: Part II