humans' relationship to the environment and other species, the role of instinct and love, and the inherent anthropocentrism of morality. Shinichi's experience with Migi causes him to question if humanity has any right to claim moral superiority to the Parasites, while Migi and Reiko Tamura's experiences with humans cause them to take on more human traits, such as love and sacrifice. Development Iwaaki chose a high school setting due to a scene he had thought of. When considering a scene where Migi turns his shape into a penis in front of Satomi Murano, Iwaaki believed that the scene would work best in a high school setting, so Iwaaki gave Parasyte a high school setting. Media Manga Parasyte was originally serialized in Kodansha's Morning Open Zōkan from 1988 and switched to Monthly Afternoon after a few issues, where it ran from 1990 to 1995. Kodansha collected its chapters in ten tankōbon volumes, released from July 20, 1990, to March 15, 1995. It was later republished in eight kanzenban volumes from January 21 to June 21, 2003. It was originally licensed for English translation and North American distribution by Tokyopop, which published the series over 12 volumes. The Tokyopop version ran in Mixxzine. Daily pages from the Tokyopop version ran in the Japanimation Station, a service accessible to users of America Online. The Tokyopop English-language manga went out of print on May 2, 2005. Del Rey Manga later acquired the rights to the series, and published eight volumes following the kanzenban release. Kodansha Comics later republished the volumes in North America between 2011 and 2012. Tributes and spin-off A tribute project titled , consisting of various one-shots written and illustrated by various manga artists, and based on the original manga to promote the then upcoming anime adaptation, began publishing on Monthly Afternoon on September 25, 2014. The list of collaborators includes Akira Hiramoto, Yukari Takinami, Yasushi Nirasawa, Hiroki Endo, Riichi Ueshiba, Ryōji Minagawa, Takatoshi Kumakura, Peach-Pit, Hiro Mashima, Moare Ohta, Takayuki Takeya and Moto Hagio. The stories were collected into a single volume, published by Kodansha on July 22, 2016. In North America, Kodansha USA published the volume on November 21, 2017. Another tribute project, titled , began in Kodansha's Aria on September 27, 2014. The list of collaborators includes MikiMaki, Miki Rinno, Ema Tōyama, Hikaru Suruga, Asumiko Nakamura, Kaori Yuki, Yuri Narushima, Yui Kuroe, Renjuro Kindaichi, Banko Kuze, Kashio, Yūki Obata,