All gameplay in Lorain takes place in underground tunnels, where you can encounter a variety of monsters who are aggressively targeting the main character. This 2D platformer puts you in control of a woman who must fend off a large number of enemies. The latter are eager to meet the girl, as they seek to satisfy their sexual desires. There are numerous intimate scenes. The protagonist, Lorraine, must embark on exciting adventures full of surprises and debauchery. She must carry out various scams to earn as much money as possible. The heroine must avoid those she has previously robbed.