 If you liked
Ryokunohara Labyrinth: Sparkling Phantom
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 ...then you might like
Majo demo Steady
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Two romance OVAs from the 80s with supernatural events, alternate dimensions, doppelgangers, gays (Ryokunohara Meikyuu is BL and Majo demo Steady has the stereotypical from the 80's) and a red-haired girl who is the culprit surely.
Also they're probably the weirdest and non-sensical stuff you'll ever watch. Ryokunohara Meikyuu is more like a wasted potential drama and Majo demo Steady is a romantic comedy so bad it's good.