ShiKage's Ultimate Hayato Guide

Yeah. Yanagi Yoke most definitely works on GMS. The animation shows up and no damage is taken, so that's good enough for me.

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Can't you max those later with the spare 4th job sp at 18x or do they only work for the 4th job skills?[/COLOR]

Each job advancement's SP is specific to that job advancement. So... You can only use 4th job SP on 4th job skills.