Yagura has been frustrating me. Mostly because all these "quick" and "Auto" teams put up by old level 80-90 players don't even come close to winning. I have been successful with this lineup 6 out of 8 attempts. Last week at level 77, this lineup failed. So, I think level 79 is the lowest I would try solo unless old and overpowered for your level. The key to success is your water main, by the last round main will do 12-14k damage on standard attacks.

Other Factors: Battle Armor 24/3, all ninjas used are max cultivations/awaken, tenten and main have +25% mood kimi and kabuto have 0% mood, max equip strengthen, and power = 31074. Character age: 74 days (~2.5 months)

Lineup:
TenTen (GNW)** - Kimimaro*** - X
Kabuto**** - Water Main**** - X
X-X-X

Talents: 3-4-3-4-3
Summon: Monkey King or Gorilla (High Float -> Knockdown)

Wave 1:
round 1 - use kabuto before enemies cast immobile (they will all target kabuto)
round 2 - wait for all immobile to go, then use water main heal
round 3 - use kabuto before enemies cast immobile again
round 4 on --don't use any mysteries, just let them keep making your mater main stronger

Wave 2:
round 1 - target lightning and use kimimaro and kabuto
round 2 - use tenten and healing if you need it.
continue using mysteries killing lightning, then earth, then fire. Once those 3 are dead, then stop using kimimaro and tenten mystery attacks. Should tenten or kimimaro die this round, then you are likely doomed to fail.

Wave 3:
round 1 - target Mei and use kimimaro and kabuto skills, and tenten once it is available. (mei should be dead)
continue using mysteries as available target Chojuro, then Yagura, then Ao.

Wave 4:
round 1 - target Yagura and use any mysteries you have.
once yagura is dead, then target Son Goku, then the last. But really once yagura is dead it will only take 2 rounds for your main to kill them both using standard attack.