There are two brief tales in this book. The first centers around Bun and his search for a replacement for Satoru from Heat in the form of a new kid. The second story delves into the relationship between Bun and Daisuke.
Miyamoto Kano's "Walker" universe timeline is as follows:
1)
2)
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3)
-- Under the Skin
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The doujinshis (marked with --) provide context and additional information to certain key moments in the primary storyline. Thus, not reading them wouldn't significantly impact your understanding of the overarching narrative.
