Shirami is an older man with a short crop of dark-colored hair.
Shirami is a serial arsonist, committing a total of five cases of arson in northern Tokyo, burning property completely to the ground and killing thirteen people. On November 5, 2003 (2006 in anime) he was arrested while attempting to commit a sixth arson.
In order to test the limits of the Death Note, Light Yagami writes Shirami's name. In his prison cell, listed as Prison #21, he cuts his finger and draws a five-pointed star inside of a circle on his cell wall. After doing so, Shirami dies from a heart attack.
- In addition to Shirami, Light's tests also work on Ken Yadanaka and Tasayoshi Yoda. His tests fail on Shiniichiro Yamasaki, Yuzo Butsura, and Hitoshi Kabeoka. The next day, he does another successful test on Matsushiro Nakaokaji.
- What Shirami drew was a pentagram, a symbol of the religion of Wicca. However, despite its relation to the Wiccan religion, these pentagrams are often mistakenly associated with Satanism, which is possibly why Light chose to have him draw this.