Natsu No Arashi! (2009) S1E01

On a very auspicious summer day, first year middle school student Hajime Yasaka was making a small prank bomb for his school's "research project," and from its appearance it looked very much like an actual piece of strawberry. However inside the cherry bomb, it was filled with a large variety and amount of hot spices to be exploded once lit. Planning to put in on a strawberry cake and giving it to a classmate whom he did not get along with, Yasaka did not keep an eye on the strawberry bomb and the fuse was lit.