The cheapest Sekai Project game right now is WORLD END ECONOMiCA episode.03 at A$0.63 (Eneba), of the 49 we compare.
Right now we have in-stock offers for Sekai Project games from Eneba, G2A, Gamivo, HRK Game, Instant Gaming, K4G, Kinguin and Steam.
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.