Based on a series of Chiikawa comics posted on X by Nagano from March to November 2023, known as the "Siren Arc". 
One day, while Chiikawa and Hachiware were relaxing in the square, Usagi suddenly appeared with a flyer stuck to its face. When Hachiware checked the flyer, it was an invitation reading “Special Invitation to a Special Island.” 

Lured by promises like “Get 100x rewards for simple island quests!” and “Limited-edition island ramen, exclusive sweets—sweet and spicy treats all practically free!”, Chiikawa and the others decided to go on the island retreat. Boarding the ship alongside Rakko, who was suspicious of the flyer's contents, the group landed on the island... only to find something waiting for them there...!? 
(Source: Official Site, translated)

The sometimes happy, sometimes sad, and a tad stressful daily life of "some sort of small, cute creature" known as Chiikawa. Chiikawa enjoys delicious food with bees and rabbits, toils hard every day for the rewards of work, and still maintains a smile. 
 
(Source: Anime News Network)

The sometimes happy, sometimes sad, and a tad stressful daily life of "some sort of small, cute creature" known as Chiikawa. Chiikawa enjoys delicious food with bees and rabbits, toils hard every day for the rewards of work, and still maintains a smile.
 
(Source: Anime News Network)
 
Note: The manga started being published by Nagano in their own Twitter since January, 2020. The manga got licensed by the publishing editorial Kodansha on February, 2021.

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