Clutzy nurse/maid causes havoc at private hospital/secret research lab. Back cover says "A mind is a terrible thing to waste, but not according Dr. Ogami who wants to turn his dim-witted nurse assistant Nanako into his next guinea pig. Working for a mad scientist is hard enough, but poor Nanako has just become the target of out-of-control mechas, mutating monsters and global conspiracies!"
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DVD - Amazing Nurse Nanako (OVA 2000)