Tsurumaru will beat this just about everywhere. This isn't a bad great katana, but Save TP +25 (along with 15 ACC) can't be beaten in Ionis zones short of Kogarasumaru.
if you lack ACC and ATT or want to build a ACC set, go with Tsurumaru.
If you like to WS/SC on your own, and u dont lack ACC and ATT, then this is the GK for you. Possible 4/hit build with this GK and a good sTP set that meets or exceeds the "Save TP 250" from shark GK, makes for VERY Fast and i mean VERY Fast WSing.
Possible to do 6 WS/SC Darkness with this GK without the use of meditation, Sekkanoki, Hagakure, Konzen-ittai.
IMPO: Shark GK beats this GK by a VERY small fraction... every so often.
Gekko>Yukikaze>Kasha>Yukikaze>Kasha>Gekko. Try it, you will love it.
Upgradable to Rank 15 with Oboro for 300 additional Beitetsu, riftborn boulders or plutons (1st sets the type and does not count towards ranks then add 299 of the SAME type)
Pre-requisites:
Having the Kurikaranotachi.
The Key Item:"Scintillating Rhapsody", obtained from the final Rhapsodies of Vana'diel Mission, must be obtained first in order to begin the augmenting process for these items.