Chapter 89
[+400 Power Stone Bonus Chapter!!]
This was Natsuki's suggestion.
The reason he gave was that since Team 9 was Aoba's team, they needed a characteristic unique to them — so wearing green sunglasses would do.
Anyway, wearing sunglasses looked pretty cool, much better than wearing a green tight suit and turning into a kappa.
But the real reason was to be able to unleash Taiyōken (Solar Flare) at any time.
Starting from the Chūnin Exams, they would gradually encounter stronger opponents, and even Natsuki wasn't confident he could win every battle.
That's where Taiyōken (Solar Flare) would come into play.
With everyone wearing sunglasses, when facing a tough opponent, they could use a single Taiyōken to blind them temporarily — buying enough time to counterattack or flee.
It was a very good strategy.
Taiyōken was an excellent technique for pulling dirty tricks.
Just think of Dragon Ball — Cell used Taiyōken multiple times to escape pursuit, eventually evolving into his perfect form and thrashing the protagonist group.
Taiyōken, truly the ultimate escape move!