It looks imposing, but this tank is so poorly armored that it should break under your chopsticks. Brian Ashcraft of Kotaku tells us about this fishy tank:
As pointed out by Naver, a sushi restaurant called Kurisakiya began offering a tank sushi in honor of Japanese anime Girls und Panzer.
The military girls anime is set in the town of Oarai in Ibaraki Prefecture, which is where Kurisakiya is located. Thus, tank sushi!
Girls und Panzer features real Oarai locations, and that helps create local tourism: Anime fans often like visiting real-world locales featured in their favorite cartoons.