Panties

Life with your sister x action battle x roguelike x open-world fantasy role-playing game! The player takes on the role of a lone adventurer in a dungeon, living with his sister. To cure his sister's special illness, he constantly searches for...

Main character is a scientist who has invented a way to increase sexual desire and sensitivity in women. There is a short-term memory loss. In other words, a person who has taken the medicine enjoys vivid sexual sensations but then can not remember...