为庆祝《摇曳百合♪♪》开播，官方将会在NICONICO静画连载其外传漫画《大室家》，并于每周一晚2时30分免费公开。也就是说大家在看完《摇曳百合♪♪》之后，可以继续看其外传。《大室家》是以《摇曳百合》中因和古谷向日葵的CP而博得人气的大室樱子为主人公，描写大室家三姐妹扶子、樱子、花子以及她们同学的故事。

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