There's no Nitori, either. That's because they're not goddesses, I'd reckon. NO ARMPITS. GODDESSES ONLY. FINAL DESTINATION. I'd go check pixiv to see if there was something clever in the title/description/tags, but I'm too tired for that right now.
(And yeah, the left sleeve is almost undoubtedly Suwako, especially given her right is Kanako.)