Yaranaika (やらないか) or "Shall we do it?" is a popular catchphrase that stems from the opening dialogue in Kuso Miso Technique, a Bara manga drawn by Yamakawa Junichi. The manga title's literal translation reads "Shit Soup Technique" in English.
In this scene, Masaki Michishita, an average college student, is walking through the park to use the public toilet when he crosses eyes with Takakazu Abe, an older mechanic sitting on a bench. Upon seeing him, Masaki says to himself "Uho! Hot guy!" (うほ、いい男! - Uho! iiotoko!) while Abe promptly unzips his jumpsuit, reveals his "unit" out in the open and asks, "Shall We Do It?" (やらないか? - Yaranaika?), the rest of story is history.
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For references specific to characters and other scenes in the manga, please use the kuso miso technique, Abe Takakazu or Michishita Masaki tags instead.