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Ore no Yuusha, 俺の勇者
Japanese Web Novel
I have a childhood friend.
We did stupid things, made the adults angry, were put to cleaning the toilets together, complained it was a pain and went off to play, only to make them angry again. When we were kicked out to sleep in the shed, we made a ruckus all the way through the night, received the iron fist to the head, and grew older together.
That friend became the hero and saved the world.