Asking as a non BA player. Is this a joke about Yuuka have a huge butt and thighs?
In one side story the rumor was born that she weoghs 100 kilos, then some random NPC said that she doesn't look that heavy, to which another replied it must be the thighs. And that is the origin of Yuuka's 100kg thunder thighs.
Asking as a non BA player. Is this a joke about Yuuka have a huge butt and thighs?
The short of it is that some students from a hacking club were playing around with the school's physical record. One of them had the bright idea of changing Yuuka's weight to 100kg, then what Incineration said happens, and the rest is history.