Really nice. Love her sinister smirk afterwards. I'd love to see a page between page 3 and 4, showing Kato either with a neutral closed-eyes face or struggling slightly against the possession.
I'm a big fan of three- or even four-step possession processes:
1) shock/surprise from getting possessed
2) losing struggle by host (optional; can be merged with 3)
3) neutral/calm
4) reveal that she's possessed (usually via an evil/pervy grin)