The most successful example was making a wasa adopted by a indulgent mother Reimu, but still the wasa died by accident when playing.
Even with all the potential danger removed, the wasas could simply die as long as the parents are being careless.To begin with, it's impossible for fools and scum families who don't cull wasas, or ordinary yukkuris who dislike wasas to raise wasa yukkuris.They never have the idea of "raising the wasa until she becomes an adult", so such outcomes shouldn't be surprising.
Only the wasa survived
(Unable to endure the loneliness, she died soon after)
I've tried various approaches, but none of them worked.
Therefore I adopted some wasa-breeding families, and promised to reward them if they successfully raise up the wasa.
In other cases I adopted families unrelated to the wasa, and also promised to reward them if they can do that successfully.
If they'd die from loneliness, will it be good if we let yukkuris raise them?
They start killing each other because of the wasa, or the wasa gets killed for being overly selfish...
Munch-munch!
The wasa gets eaten
The wasa gets killed
The family die out