Summon Night Twin Age, I thought the story was fine, not as funny as the one in the Swordcraft Story games but it had some sweet, heartfelt moments. I don't care if I can beat the game in one day, I still find it entretaining, although I do think that if Atlus didn't made the game easier when they brough it to America I would have enjoyed it more, still I don't think I should expect amazing gameplay from a Summon Night game, they are almost visual novels and that's what i like about them, the gameplay to me is just like an additional feature (but I know that's weird to say since everyone in the world says that gameplay is the most important thing in a videogame, well not always to me).
I'll probably add Summon Night 4 if the fan translation ever get's done (or learn enough Japanese, whatever comes first). All them japs don't like androgynous dragon children (joking, i don't know why they hate Summon Night 4).