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ZEROSYSTEM Co.,Ltd. (株式会社ゼロシステム), established January 24, 1995 in Ikebukuro, Toyotama-ku, Tokyo and moved to Bunkyo-ku around 2002. Headed by Takao Ike (池高生), previously of Glodia. Appears to have been closely connected to OAKS [1], run by ex-KID staffer Motoyuki Inoue (井上智元), though the details of this are unknown. PrincessSoft was a bishoujo game publishing brand used by Zerosystem and later by OAKS.

Some of the staff left to join Media Jungle in 1998, while other former staff started Crest Works in 2002.


  • 21: TwoOne (JP Publisher: PrincessSoft)
  • D+VINE[LUV] (JP Publisher: PrincessSoft)
Support?: StudioNorthalt, Feathered
  • Nijuuei (JP Publisher: PrincessSoft)


  • Photogenic (scenario, game design, some programming, some graphics, sound effects) (JP Publisher: Sunsoft)
Planning, Coordination, Music: Fill in Cafe; Some Programming: Watanabe Koumuten; Graphics Support: Outback, Upshot
  • Ryuuki Denshou: Dragoon (JP Publisher: KSS)


  • Ayakashi Ninden Kunoichiban (JP Publisher: Shoeisha)
Planning: Sugeiya
  • Blade Maker (JP Publisher: Shoeisha)
  • Choro Q Marine: Q Boat (some graphics) (JP Publisher: Takara)
Developer: Barnhouse Effect; Sound: Reeb
  • Doki Doki Poyacchio (some graphics) (JP Publisher: King Records)
Planning: Studio Saizensen; Programming, Tools: M2; Sound: USP
  • Furimukeba Tonari ni (JP Publisher: PrincessSoft)
  • Hexamoon Guardians (JP Publisher: Increment P)
  • Jockey Zero (some planning, main programming, some editing) (JP Publisher Right Stuff)
  • Koi Yohou (JP Publisher: PrincessSoft)
  • Misaki Aggressive! (JP Publisher: Shoeisha)
Planning: Sugeiya
  • Nukumori no Naka de (JP Publisher: PrincessSoft)
  • PAL: Shinken Densetsu (some background graphics) (JP Publisher: Tohoku Shinsha)
Developer: Fill in Cafe
  • Photogenic (JP Publisher: Sunsoft)
Production, Sound, Some Graphics: Fill in Cafe; Animation Production: Jitensha; Some Graphics: Astrovision, Outback, Upshot
  • Ready Maid (JP Publisher: PrincessSoft)
  • Shadow and Shadow (JP Publisher: PrincessSoft)
  • Water Summer (JP Publisher: PrincessSoft)
  • Yukinko Burning (JP Publisher: PrincessSoft)
  • Yuukyuu no Eden (JP Publisher: ASCII)
Sound: Team X-Fade, Two-Five
  • Zero4 Champ DooZy-J (co-developed with Fill in Cafe?) (JP Publisher: Media Rings)

PlayStation 2[edit]

  • Cafe Little Wish: Mahou no Recipe (JP Publisher: PrincessSoft)
  • Happy Breeding (JP Publisher: PrincessSoft)
  • Lost Passage: Ushinawareta Hitosuji (JP Publisher: PrincessSoft)
  • Marge: Ano Toki no Tooi Yakusoku o (JP Publisher: PrincessSoft)
  • Natsuiro Komachi: Ichinichi Chinatsu (JP Publisher: PrincessSoft)
  • Natsuiro no Sunadokei (JP Publisher: PrincessSoft)
  • Phantom: Phantom of Inferno (JP Publisher: PrincessSoft)
  • Sakura: Yukitsukihana (JP Publisher: PrincessSoft)


  • Ayakashi Ninden Kunoichiban Plus (JP Publisher: Shoeisha)
Planning: Sugeiya
  • Langrisser V: The End of Legend (some map design) (JP Publisher: Masaya)
  • Photogenic (JP Publisher: Sunsoft)


  • Ayakashi Ninden Kunoichiban (JP Publisher: Shoeisha)
Planning: Sugeiya
  • CyberNetDerby (KR Publisher: m-dream)
  • Madori (KR Publisher: Fullerene Consulting)