The main character is Tsuki Hayakawa, the daughter of Takeru, Yui's younger brother from Ashi-Girl. One day, the time machine built by Takeru is activated for the first time in 15 years, and Tama-hime, the younger sister of Hisanaga, is brought back from the Edo period. Tama-hime tells Tsuki that she had to give up on the man she loves and will soon be married into the family of a feudal lord. Tsuki, who is an inventor prone to doing "outrageous things" just like her father, decides makes a big move...
 
(Source: Natalie, translated)

Hayakawa Yui is totally a unmotivated, lazy girl who loves sleeping and eating. She's 16 but looks like a boy from elementary school; her one and only talent is to run really fast. After accidentally switching on the time machine which her younger brother made she travels to the Sengoku period, where luckily she joins retreating foot soldiers using the name Yuinosuke. Then she eats some amanitas and meets the man of her dreams.
 
Note: Includes 6 extra chapters.

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