Digital Zero Beast.

Summary

In a park, a shy boy meets a girl in a white dress who asks if he likes heroes. They make a pinky promise to become heroes one day. The girl leaves, promising to return. In a hospital, another girl also meets the same girl in white, who encourages her to make a similar promise. The girl in white then visits a boy at home, where he eagerly agrees to the promise. After visiting a final boy at a cram school, the girl in white declares her mission is complete, leaving the outcome to the boys. She then vanishes, marking the end of the chapter.

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