The war is called "Kinoko-Takenoko War"(きのこたけのこ戦争)
In english, "Mushroom-BambooShoot War"
Do you know?
No, i dont know so how about some explanation?
8 years later and still wating for an explanation
https://ja.wikipedia.org/wiki/%E3%81%8D%E3%81%AE%E3%81%93%E3%81%9F%E3%81%91%E3%81%AE%E3%81%93%E6%88%A6%E4%BA%89
Japanese fight over which shit-shaped candy taste better on tongues.