A genius chef that has been an attendant of Wet Crow's Feather Island for the longest out of anyone else: Yayoi Sashirono. Acting as the island's main chef, she makes exquisite meals that are rumoured to be impossible to recreate even with a recipe. When Yayoi was younger, she opted to become a chef as she has phenomenal tasting and smelling abilities, able to discern much more flavours and scents than the average person. On top of that, she is able to figure out a person's  from tasting their sweat. 

Unlike most of the other island residents and guests,Yayoi herself is down to earth and exuberant. Despite her great abilities as a chef, she is not arrogant whatsoever and just enjoys cooking. ~!As the decapitations occur, Yayoi is greatly affected unlike the others, and becomes extremely paranoid. She, along with Ii and Tomo Kunagisa solve the mystery of the decapitations and throw a ruse to catch the culprits.!~

It's the vacation of a lifetime, a trip to a remote island filled with geniuses–and murder. 
 
On Wet Crow's Feather Island, a tiny speck in the Sea of Japan, lives Akagami Iria, the exiled daughter of a powerful family. Born into great wealth, she was a princess of the highest pedigree–until she was cut off by the leader of the Akagami Foundation. For the last five years, she's lived on Feather Island with her maids. But she hasn't been alone. She has invited the best minds Japan has to offer to come and stay with her. 
 
And so nineteen-year-old college student Ii-chan and his best friend, computer genius Kunagisa Tomo, find themselves as Iria’s guests at her elaborate mansion. Surrounded by fascinating women – a chef, a fortune-teller, a scholar, and an artist, not to mention his own friend Tomo – Ii-chan is feeling a little overmatched intellectually. But the sudden discovery of a grisly murder sends the island into shock. And Ii-chan discovers that he does possess a bit of genius: the ability to discover what is real and what is fake, who is who they claim to be and who is a killer. 
 
(Source: Del Rey Manga)

[Twitter](https://twitter.com/haluna7)

She got married in 2020 to a man from outside the anime industry. 

A dropout from an elite Houston-based program for teens is on a visit to a private island. Its mistress, virtually marooned there, surrounds herself with geniuses, especially of the young and female kind—one of whom ends up headless one fine morning.
 
(Source: Kodansha USA)

The fourth instalment of the Saikyou Series.
 
Aikawa Jun, Humanity's Strongest Contractor. This time, she's been asked to protect the fortune teller's child, Himena Genki, from the "death" she predicted. What is the strongest way to change the future? An adventure story about falling in love with "nonsense", loving "humans", and being thrilled by "the strongest" comes to a close!
 
(Source: Kodansha, translated)