Supported crossplay platforms:

Dragon Quest Heroes II is supporting cross-play across multiple platforms. Currently it is possible to play together with your friends on Playstation 3, Playstation 4 and Playstation Vita.

Summary:

"DRAGON QUEST HEROES II is a hack-and-slash, field-roaming Action RPG that sends players on a new adventure to restore order in a once peaceful world filled with hordes of monsters and battles of epic proportions. Up to 4 players can band together in cooperative multiplayer to conquer swarms of enemies and defeat challenging boss monsters. There is also a cast of many playable characters each with unique moves and abilities – including a host of familiar faces from the DRAGON QUEST series and four brand new heroes that must team up to defeat an unknown threat looming over the Seven Realms!"