The Mischievous Gal Anjou-san

Seto is a serious kid who leads a quiet high school life, until he starts to get teased by resident gal Anjou-san.

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Note: While the pixiv album for the Preserialization has 25 posts, there are only 23 Preserialization chapters because the 23rd post is Serialization Chapter 2 and the 24th post is Serialization Chapter 14.