Hi! Thanks so much for helping. Courtesy is to the community team for helping with the calculation.

For Mission General Mobilization, there is a small correction where Yamato [Anbu] actually unlocks at 2 stars. To unlock, Yamato [Anbu] requires 1800 points which costs 3600 coupons/ingots.

While, 2 star to 3 star requires 3000 points which costs around 6000 coupons/ingots.

The total for a 3 star Yamato [Anbu] would be 4800 points or 9600 coupons/ingots.