On a massive luxury cruise ship while at sea, the loyal butler and a mysterious woman cross paths as they try to uncover a murder-mystery that occurs on the ship.

Hiyori (Kei Tanaka) is an ornithologist (expert on birds). His wife is Rinko (Miki Nakatani). She is the leader the minority opposition party. One morning, Hiyori is about to travel…

Kiyosumi’s affection for his schoolmate Hari grows after he saves her from bullying, but a dark secret she’s unwilling to share threatens their bond.