Nisekoi: False Love, Volume 13: Don't Worry — Naoshi Komi

Haru has always loathed Raku because she thinks he's a no-good player, but things take a surprising turn when she finds out that Raku and Chitoge's relationship is fake and she ends up spending time with him at a festival... Meanwhile, Ruri's great-grandfather is near death, and his one request is to meet Ruri's boyfriend. Somehow, Raku gets roped into playing the part!