After Hina Kobayashi’s death, her name gets dragged into a scandal: her sister is named suspect in the murder posthumously for selfish motives. Mio doesn’t accept this version and decides to find out herself what really happened.
Since childhood, Mio has lived in the shadow of others: while Hina was everyone’s favorite, Mio had to do the hardest work in the family restaurant. Then the family fell apart— her father was killed, her mother disappeared, and the sisters were separated. Their rare meeting years later was brief—and it became the last one.
Trying to clear Hina’s name, Mio step by step dissects her sister’s life and discovers that the image of the “perfect” sister was only a mask. Behind outward well-being lurk dangerous acquaintances, secret matters, and a past better not to look into. The farther the investigation goes, the clearer it becomes: someone is methodically destroying their family—and Mio risks becoming the next target.