Fuuka Esumi is an elementary schoolgirl who stands at 163cm tall and has the figure of an university student.    Due to the way she looks, she causes many misunderstandings.

Her name is Esumi Fuuka. Standing tall at 163 cm with a slender bodyline, she must be a university undergraduate. However, in reality, she is only an elementary school student. With a body figure of an adult and the mentality of a small child, she creates many misunderstandings around her.

Fuuka Esumi is definitely not an ordinary fifth-grader (11 y.o): with the height of 163.5 cm, weighs 50 kg, and a body figure of an adult female, she sure causes a lot of misunderstanding and embarrassment.
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(Source: AnimeNewsNetwork) 