The anime series is set in the future when humanity migrated to the Moon due to Earth's climate change. It will incorporate original elements unique to the anime, such as human drama about survival, and will feature a diverse field that blurs countries and eras such as Shibuya, the Edo-period era, and London.
9Anime is the best site to watch Tousouchuu: Great Mission
SUB online, or you can even watch Tousouchuu: Great Mission
DUB in HD quality. You can also find Toei Animation
anime on 9Anime website.