A cross-over game between the Star Soldier series by Hudson and the DoDonPachi series by Cave. The game combined a variety of elements between the two series such as ships and stages.

The ships and stages available depended on whether you were subscribed to Hudson's Chaku☆Apu♪ service or Cave's Game Center Yokocho service. Users only registered on Hudson's Chaku☆Apu♪ service are able to play as Caesar in "Dodonpachi Daioujou Stage” and "Caravan Stage", and "Gokujo Shooting Arcade Yokocho". Users only registered on Cave's Game Center Yokocho service are only able to play as Type-A on the "Caravan Stage". Users with accounts on both services are able to use all ships and stages freely. The Caravan Stage features enemies and music from both series in the crossover.