Author Chapter 68 (Hitoribocchi no ○○ Seikatsu)
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@contrast123 I believe Yamada is Aru's friend from the tennis club.
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I hope that in the end both bocchi and her friend grow enough to be able to let go of this autistic promise, as she has clearly already fulfilled it in spirit.
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For some reason, I can't help but feel this chapter was a response to all the people who watched the anime and went "Kai-chan is terrible! Why did she make Bocchi have to become friends with the entire class!? That's just too much!! Boo Kai-chan!"