Oikawa will argue for the silliest thingsIt doesn't matter what it is
If he believes strongly enough in it he'll assert his opinion very aggressively
Just ask poor Makki and Mattsun
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One of Those Haikyuu Headcanon Books
RandomHeadcanons about everybody's favorite vball freaks Reached #38 in Random at one point :D
Pointlessness
Oikawa will argue for the silliest thingsIt doesn't matter what it is
If he believes strongly enough in it he'll assert his opinion very aggressively
Just ask poor Makki and Mattsun