Tobira wo Akete

In both anime the heroine gets transported in another world where she finds out that she is a legendary warrior and that she must fight against an evil ruler. 

Sword & sorcery-like plots driving female protagonists against world-conquering evils. Lemnear might be a bit grittier. It takes itself seriously with more bare skin and blood. Tobira allows a bit more character development and the villain has a few more dimensions than the one from Lemnear. But each film—both are one-shot OVAs from the late 80s—has more than enough fun and surprises to keep one entertained. These OVAs won't change your life, but they should entertain. 

The main heroines of these anime are extremely comparable in terms of bravery and choice of attire since they share similar old school high fantasy design philosophy and art direction of badass female warriors in bikini armors surmounting difficult hurdles to attain their goals.