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Mikaeri wo Motomeru Athena-san

Ishida is a boy who lives by the motto: "Don't expect anything from people—just keep doing good deeds." Right after entering high school, Ishida meets a blonde beauty, Athena Fujisaki, whose beliefs are the complete opposite of his. She absolutely wants to help anyone in need—however, she is not a pure-hearted good person. She's a peculiar and dangerous girl who demands an equal return for every favor she does! A coming of age comedy about a well-meaning but chaotic girl whose goodwill goes off the rails and the laid-back boy caught in her wake!!

(Source: Kodansha, translated)