The kind of fanservice movie one could completely skip without missing many details for the (inevitable) second season... but fans definitely won't want to do so. They'd be missing a lot of fun.
Red River (eBook 4 of 28)
Title: Red River
Volume: eBook 4 / 28
Distributor: Viz Media
Release date: 2013-04-09
Suggested retail price: $4.99
Battle between the ancient empires of Hattusa and Mittani rages on, but Yuri is pulled away by Zannanza, Prince Kail's half-brother and his competitor for Yuri's affections. Kail, seeing evidence of another man's passion for Yuri, recoils with jealousy and refuses to let her back into the fray. However, twenty-first century teen Yuri is thought to be good luck on the battlefield, and Kail relents, allowing Yuri to fight alongside him for the kingdom of Hattusa. Knowing that the time will soon come when he must ...
(added on 2013-03-22, modified on 2013-03-22)
- Encyclopedia information about Red River (manga)