Each console will come with their own dedicated controller or game:
Sega Master System comes with Alex Kidd
Sega Mega Drive comes with Sonic The Hedgehog
Sega Game Gear comes with Puyo Puyo
Sega Saturn comes with Virtua Fighter
Sega Dreamcast comes with Space Channel 5
Preorders for the set is available on the official preorder page for ¥3,273 which is around $31.10 USD. Those who preorder before September 24th will also receive an extra pair of hands and a Mega Drive controller.