The “Shin Megami Tensei” series may be the epitome of cult video-game franchises, barely known by most players but beloved by a small but devoted core of fans. The name means “true reincarnation of the goddess,” and publisher Atlus has stuck with it despite the lack of any notable goddesses in recent installments. What it has come to stand for is a kind of deep, demanding role-playing adventure that few companies are publishing these days.