Natsu System

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Natsu System logo

Natsu System (有限会社夏システム) had an eroge brand called "Summer." [1] ("Natsu" means "summer" in Japanese.) The company was presumably headed by Shinichiro Yoshikawa (吉川真一郎).

Research Methods: Online resources (see Links), shared staff


  • Beach de Reach! (unreleased?)
  • Mokugeki / DownTown (sound effects) (Seta)
Music: Goblin Sound
  • U.S. Classic (sound effects) (Seta)
Music: Goblin Sound

Game Boy

  • Doraemon Cart (JP Publisher: Epoch)
Sound: Team X-Fade
  • Initial D Gaiden (JP Publisher: Kodansha)
Sound: Team X-Fade
  • Nakajima Satoru Kanshuu F-1 Hero GB (programming) (JP Publisher: Varie)
  • Nakajima Satoru Kanshuu F-1 Hero GB '92 / F1 Pole Position (programming) (JP Publisher: Varie; US Publisher: Ubisoft)
  • Pachinko CR Daiku no Gen-san GB (JP Publisher: Nihon Telenet)
Sound: Team X-Fade
  • Pachi-Slot Hisshou Guide GB (JP Publisher: Magifact)
Sound: Team X-Fade
  • Palamedes ([some?] programming) (JP Publisher: Hot-B)
Co-Developer: Natsume
  • Panel Action Bingo (US Publisher: FCI)
  • Renju Club (JP Publisher: Hect)
  • Vattle Giuce (JP Publisher: IGS)

Game Boy Color

  • Doraemon Cart 2 (JP Publisher: Epoch)
  • Honkaku Shougi: Shougi Ou (JP Publisher: Warashi)

Game Gear

  • Putt & Putter / Minigolf (programming?) (JP/US/EU Publisher: Sega; KR Publisher: Samsung; BR Publisher: Tec Toy)


  • CRW: Counter Revolution War (JP Publisher: Acclaim)
Movie: Studio Fantasia; Sound: Team X-Fade
  • Katou Hifumi Kudan Shougi Club (JP Publisher: Hect)
  • Mahjong Club (JP Publisher: Hect)
  • Tutankhamun no Nazo: Ankh (co-developer) (JP Publisher: Ray Corporation)
Co-Developer: Warashi


  • Beach de Reach! (JP Publisher: MyCom)
Sound: Team X-Fade
  • Pyon Pyon Kyaruru no Mahjong Hiyori (JP Publisher: Natsume)
Sound: Team X-Fade

Super Famicom/Super NES

  • Katou Hifumi Kudan Shougi Club (JP Publisher: Hect)
  • Mahjong Club (JP Publisher: Hect)
  • Shin Shougi Club (JP Publisher: Hect)
  • Shougi Club (JP Publisher: Hect)
  • Table Game Daishuugou!! (programming) (JP Publisher: Varie)
  • Wally o Sagase!: Ehon no Kuni no Daibouken (programming) (JP Publisher: Tomy)
Co-Developer: Opus


  • Mahjong Aotenjou for Windows (JP Publisher: Mycom)