English subtitles are included in this video. They can be accessed by clicking the CC button then selecting English.
This is the very start of the Fire Emblem if game (also known as Fire Emblem Fates when it hits North America in 2016). This is just the Chapter Zero of the game where the basic mechanics are introduced.
Chapter Zero, along with the first 6 chapters, will be shared between both versions of the game. Then they will split as your protagonist makes a critical choice.
Translation by PharaohsVizier.
For more Fire Emblem if videos, check out DSDatabase.org.