The cheapest Eroge Japan game right now is Witch's Rhythm Puzzle at €2.99 (GOG), of the 16 we compare.
Right now we have in-stock offers for Eroge Japan games from G2A, GOG, K4G and Kinguin.
Not always. Stores that sell their own keys, such as Steam and GOG, add no service fee, though sales tax is added at checkout in the US and Canada. Marketplaces add a service fee at checkout, and some payment methods add their own, so on a marketplace the total at checkout will be higher than the price listed here.