Warriors Orochi 4/Story Mode

Like all previous Warriors Orochi games, Warriors Orochi 4 has it's own fictional story mode which involves an amalgamation of all characters from the Samurai Warriors and Dynasty Warriors franchise to solve a mystical problem, which unlike the previous three games, is not really instigated by Orochi but rather, it is now done by Zeus who watched the efforts of those who vanquished the demon last time, and he summoned them to the Greek world for what starts out as his own personal enjoyment. The story is vastly different to last time, due to the mortal characters retaining no memories of their previous visits to the dimensional world, so a lot of character interactions are different and this acts as a soft reboot of sorts, for the series. The starting characters are Tadakatsu Honda, Naotora Ii and Naomasa Ii.

Side stories (and DLC)
These stages are usually optional and like Warriors Orochi 3 can unlock new stages with character interactions and the raising of bonds in the new camp selection screen. A certain amount of characters can only be unlocked through these stages.

DLC
So far, 10 DLC stages have been advertised to come with the season pass, though they may not be relevant to the overall story and are likely to be fictional encounters.