Originally Posted by weras

You get 4 lvl 1 manyus from one of the dailies, and you get two per run of the bonus stages. The bonus stage is kinda like a raid boss, it'll randomly show up after you beat a stage, but is only available for 4-10 minutes. The bonus stage you get depends on what mission you were doing, missions 1-5 gives you the 12 stamina one, and mission 6 and up gets you the 50 stamina one, so you should try to have extra stamina when doing missions.

Other than that, there are two manyu dailies, the red and blue one is one sunday, I'm not sure when the yellow and purple one is.

Monday Mission - Get Dragons for Slice-Types evolutions (red ones)
Tuesday Mission - Get Dragons for Hit-Types evolution (blue ones)
Wednesday Mission - Get Manuys (yellow and purple)
Thursday Mission - Get Dragons for Pierce-Types evolution (yellow ones)
Friday Mission - Get Dragons for Magic-Types evolution (purple ones)
Saturday Mission - Get more Coins! Needed to level up and evolve your knights. And you need a lot of gold.
Sunday Mission - Get Manuys (red and blue)

He cant have extra stamina after doing missions above level 40, the stamina barely enough for to clear missions themselves.