__Height:__ 162 cm (5' 4")
__Nationality:__ Japanese
__Affiliation:__ Imperial Home Ministry 

The eldest daughter of four in the Isumi family. Since her two parents were musicians often away from home, Yayoi took on the role of leading the house, raising the youngest two until adulthood and managing the apartment building they own. She had a huge influence on the three of them. After everyone reached adulthood, Yayoi began working for the Imperial Home Ministry.

Yayoi is practically a genius and everything seems to come to her easily, ranging from language learning, riding a motorcycle, to learning a new job. So much so she envies the type of life where a person pursues their dream through all hardship. She hasn't experienced it. This led to tension between her and Michiru, who are almost opposites in that way. 

She's a kind and caring person who loves her sisters more than anything. Always smiling, liking to celebrate any and everything with everyone. Her and Masaki have treated each other like siblings as well, though it's hard for them to tell whether that love is familial or romantic at all.


In Muv-Luv Alternative, Takeru wakes up three years after the end of Muv-Luv Unlimited to find himself back in his room. Although he first thinks that everything that had happened to him was a dream, he soon feels that something is wrong, and leaves the house to find that he has been sent back in time to the beginning of the events in Unlimited. Unwilling to accept something like Alternative V, he decides to help professor Kouzuki to complete Alternative IV and save mankind. 
(Source: Wikipedia)

The second season of Muv-Luv Alternative.

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Yayoi Isumi