Natsu System

ATTENTION: This entry is a WORK IN PROGRESS
This entry is not finished. Please use with caution.

Probably a separate company from Natsume, despite doing some Natsume games and the similarities in names.

Arcade

• DownTown (sound effects) (Music: Goblin Sound; Developer, Manufacturer: Seta)

Game Boy

• Palamedes (JP Publisher: Hot-B)

PlayStation

• CRW: Counter Revolution War (JP Publisher: Acclaim)

Saturn

• Pyon Pyon Kyaruru no Mahjong Hiyori (JP Publisher: Natsume)
• Umibe de Reach! (JP Publisher: MyCom)

Super Famicom/Super NES

• Katou Ichi-Ni-San Kudan Shougi Club (JP Publisher: Hect)
• Mahjong Club (JP Publisher: Hect)
• Shin Shougi Club (JP Publisher: Hect)
• Shougi Club (co-developed with Arc?) (JP Publisher: Hect)
• Wally o Sagase!: Ehon no Kuni no Daibouken (JP Publisher: Tomy)