Copywriting:
Twin siblings Hevia and Akko received gifts from their grandmother on their 20th birthday: an old castle and a blue crystal necklace.
Hevia expressed dissatisfaction with the necklace she received, while her younger brother Akko had no favorable impressions of the castle, so the two siblings decided to exchange it privately. Unexpectedly, a supernatural incident occurred at this moment that shocked the two of them...
PS1: This article contains BG plot, please be careful if you are incompetent in BG! ! ~
PS2: The content of this article involves pseudo-travel, and the scammers will go around the trap! ~(Quack~~, it seems that one of them is real? No, no spoilers. - = Firmly!). ~