[B]One/three advantages:[/B]
[LIST]
[*]1. Is a nice addition to a kenjutsu user's arsenal as it can be done quickly whilst wielding a sword.
[*]2. Can be used at the same time as kenjutsu techniques which don't require chakra.
[*]3. In close range, the opponent would need to get away quickly as the sharp winds from the whirlwind would be very damaging if left unattended for long enough.[*][/LIST]
[B]One/three disadvantages:[/B]
[LIST]
[*]1. This could potentially damage the user if it is used in close range.
[*]2. Can not be preformed without a sword.
[*]3.[*][/LIST]
[B]How you would use it in battle:[/B]
In battle, I can imagine myself using this at the same time as a kenjutsu attack which doesn't require chakra. Though potentially dangerous to the user when used in close range, I could still inflict some nice damage on the opponent and put them in a pinch. I could also use this to deflect ninja tools if I wanted to. I could also use this quickly after the kenjutsu technique which sends an arc of chakra at my opponent. The first swing of my sword could send the the arc of chakra at my opponent, and the second could create the whirlwind.
[B]How you would counter it:[/B]
To counter this, I could create two fireballs using Onidōrō. One of them could crash into the whirlwind, neutralizing it, and the second could attack my opponent.
[B]How you perform it (with as much detail as you can):[/B]
Kirito focused doton chakra in his mouth, then spewed out two rock clones to use this technique on. Taking his swords off of his back, Kirito told the first clone to stand short range away from him, and the second to stand mid range. After the clones moved to the set locations, Kirito focused fuuton chakra into his blades and ran at the closer clone. Kirito swung the sword in his left hand from his right side upwards, aiming for the upper left side of the clone's chest. The clone blocked the strike with a kunai, locking the weapons. Unfortunately for the clone, Kirito had released the fuuton chakra from that blade during that slash, and a whirlwind appeared behind the clone appeared, making deep cuts into it's back. Kirito spun around clockwise while jumping into the air., bringing his sword which was previously locked with the kunai back. He landed a slash on the clone's stomach with his right sword, and at the same time released fuuton chakra from that blade. A whirlwind appeared by the feet of the clone mid range from all of this action, making him poof.