My Teen Romantic Comedy SNAFU

Once Again, He Turns Back on the Path from Whence He Came (1x5)

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Hachiman's younger sister, Hikigaya Komachi, was asked to give advice to a fellow classmate, Kawasaki Taishi. Apparently his sister had been acting strange. His older sister, Kawasaki Saki (though Hachiman wasn't aware of this), was in the same class as Hachiman and Yui, so the Service Club decided to help with the issue.