Tokyo — In the first episode of Demon Slayer: Kimetsu no Yaiba, the child hero trudges home from a day selling charcoal to find his mother and siblings slaughtered in the goriest way imaginable. Moments later, he is attacked by the sole survivor — his sister transformed into a homicidal demon.

Devotees of the popular, blood-soaked anime series can buy Demon Slayer branded strawberry milk in Japanese convenience stores. They can also buy Demon Slayer lemon-flavoured boiled sweets, curry bread luncheon sandwiches, collapsible chopsticks or a virtual pet...

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