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I watch this anime "Delico's Nursery". What is the relation between that anime and this manga? Prequel? Spin-off? I don't understand how complex Japanese pop culture/entertainments are. What is stage play. Like vtuber, vocaloid, singers that form groups, duo, concert, music, doujinshi, games, light novel etc. It so many.
Lol it so confusing. Opening YouTube, saw recommendations of J-pop, anything like that and it's never simple. It sound nice.