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What exactly is the problem about having a special contract with Cover?
Can't it just be a BEEG NDA, restrictions to promote any 3rd parties, restrictions on streaming activities and restrictions to go OOC in exchange for keeping access to YT/twitter/discord/etc. accounts and being Tsukumo Sana whenever she'll feel like it?
Assuming her not planning to become chuuba again, this sounds like a good trade-off.