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Senkai (仙界, lit Hermit World) is a dojo that can infinitely expand into any shape and size. It was built to form a new world for hermits.
Toyosatomimi no Miko and her group opposed to living beneath the Myouren Temple, so they built Senkai and moved there. Because Senkai can be expanded at any time, Miko and her group were able to move anywhere in an instant.
A few days after Reimu Hakurei battled with Miko during Ten Desires, Miko visited her shrine and apologised for her rude behavior. To make up for it, Miko invites Reimu to Senkai.