Attack on Titan: Soul of the Knight.

Summary

Mikasa has been inseparable from Arthur since he gifted her a bracelet and scarf on her birthday, leading to daily interactions. Arthur spends time with both Mikasa and Xi Si Te Li Ya, treating them like sisters. However, Xi Si Te Li Ya feels jealous of Mikasa's closeness with Arthur. When Arthur visits Mikasa, he learns her mother is ill, prompting concern. Dr. Grisha arrives to check on Mikasa's mother, and he seems startled upon meeting Xi Si Te Li Ya, raising tension. The children, including a newcomer named Alan, venture into the forest for fun but are soon confronted by a pack of wolves, putting them in danger.

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