The bulk update request #12455 has been approved by @nonamethanks.
create alias kamiyama_high_school_uniform_(sekai) -> kamiyama_high_school_uniform_(project_sekai)
remove alias kamiyama_high_school_uniform_(sekai) -> kamiyama_high_school_uniform_(project_sekai)
All the other tags uses the full name qualifier *_(project_sekai), so for the sake of consistency
Alternate solution, rename all other tags to *_(sekai) to reduce length.