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A commonly-used term in romantic anime, an osananajimi is a friend from infancy, a childhood friend or old playmate with whom one shares the special and intimate understanding that (according to such stories) can only come from having known each other since earliest childhood.
A good example of Osananajimi is Manami Tamura from Ore no imouto
by Edgar4815 November 08, 2010
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osana najimi Is a character from yandern simulator. She is a rival who try’s to take taro from ayano
Ayano: you stole senpai
Osana najimi : you got a problem with that

Taro: ? What the ?
by 123dog13 April 27, 2021
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