ramune

An excellent strategy card game. It's a bit like Pokemon and Megaman Battle Network. You collect cards and level up your cards, then in battles you deploy cards to the field. The cards grow and get more complex as the game progresses, so it stays interesting. If they removed the erotic component entirely, this would still be a great game. It's very underrated, either because reviewers are prudes, or maybe they're afraid of backlash if they give the game an honest review.