These short videos are exactly what they present themselves to be - enjoyable little videos that provide historical background on the tanks in Girls und Panzer. There is no new animation for the videos - just shots from the series, diagrams of tanks, and some actual footage of tanks in action. However, as someone who enjoys reading about tanks and armoured vehicles, the information in the videos is not just accurate, but surprisingly detailed. Yukari goes over a wide variety of material, from the effectiveness of sloped armour whilst talking about Pravda's Russian tanks, to pre-war tank doctrine whilst discussing St. Gloriana's British "infantry tanks",to mentioning how the design and production methods behind American tanks like the M3 Lee used by Ōarai and the M4 Sherman used by Saunders allowed them to be built so quickly and in such vast quantities. The researchers definitely did their job. If you like Girls und Panzer, and if you like tanks, you will like these videos.