Caged Garden Cock Robin

A girl who was apprenticed to an old castle rumored as a nest of monsters. She witnessed "something heteromorphic" which roamed around there. Although people in the castle call it "komadori", nobody tries to talk details. Robin, alone, starts investigating the hidden truth, but …… "Its all right even if its right. Its all right even if its wrong." "If I can choose only one path by which I wont regret, its for me, ―――"