Katsuobushi, a type of dried and smoked tuna that is often used to flavor dishes and is a key ingredient in dashi.

The Japanese river otter, once common throughout Japan, is now extinct due to habitat destruction and hunting.

Death Note, created by Tsugumi Ohba and Takeshi Obata in 2003, is a popular manga and anime series that follows a high school student who gains the power to kill anyone whose name he writes in a special notebook.