The original song was composed by Capcom composer Takashi Tateishi as the background music for Doctor Wily's Stage in Mega Man 2 titled "Wily's Castle (Dr. Wily Stage 1)", but was eventually rearranged by an individual solely known as "Blue Fang" (蒼い牙, Aoi Kiba).

[4] The song describes the singer reminiscing about his childhood and friends, particularly pretending to be Ultraman/Ultraseven with them, while realizing his life and theirs is nothing like what it used to be.

[7] While the original videos feature scenes taken from the Rockman 2 video game, an original flash animation of the song was made by an individual known as "Douro of DNA" (DNAのどうRO, DNA no Dōro)[8] was uploaded on May 27, 2007, to Nico Nico Douga.

Gomu's version was included as a track on the album CD de Kiite Mite.

[13] At the 2008 Animelo Summer Live concert, Hironobu Kageyama, Masaaki Endoh, Hiroshi Kitadani, Yoshiki Fukuyama, and Aki Misato performed a cover version of "Okkusenman!"