Hoshino Moe Sakuhinshuu "Giwaku no Ou, Himitsu no Ouhi"

When I woke up, a strange man was staring at me. The memory-impaired Queen, Lucretia, lives a comfortable life in a room of a gorgeous castle under the patronage of King Leo. But a shackle in her hand and a key in her room… Who the hell is this guy?