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A magical jewel puts Hikari’s life at risk after a kiss with an assassin triggers its body-swapping legend. Passed down to Hikari by his grandfather, the golden jewel is said to switch the bodies of people of opposite genders when they kiss. Hikari’s kiss with a man who is an assassin brings the legend into play. With the jewel’s power now affecting Hikari, the story follows the consequences of this unexpected encounter.