A bit surprisingly, an actual German Tiger, not Heavy Tank № 6. :)
It's so big...
(Compared to a Chi-Ha)Eight-eight!
This is not only a reference to Hachi's verbal tic of referring to herself by the German Acht, but also a nod to the Tiger's 88mm gun, known to its German builders as 8,8 cm Kampfwagenkanone 36 L/56.