Hayakawa Yui is a totally 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 she luckily joins retreating foot soldiers using the name Yuinosuke. Then…
MORIMOTO Kozueko
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Fresh out of college, Kumiko "Yankumi" Yamaguchi becomes a math teacher at an all-boys high school. Unfortunately for her, she's assigned by the school board as the homeroom teacher for class 2-D, which happens to be the class of delinquent students. When the class attempts to make a living hell out of Yankumi's career, they fail as her persistence and aggression gain their…