Chess of Blades (BL/Yaoi game)

The king is having a huge birthday celebration! Five days of dancing, festivals, and drinking, culminating in a grand masquerade ball. It just so happens that Rivian Varrison, the introverted son of a famous nobleman, is forced to attend this giant event by his father. By chance, or maybe something more deliberate, he runs into a host of colorful and shady characters, all with their own stories to tell. But when a sudden and mysterious crime happens on the second day of the celebration, Rivian finds himself thrown into the middle of it, and has to discover the truth behind what really happened -- and who the people around him really are.