Rinku is a character present in the "past" portion of Atsuko Origins: Volume 1. Alongside Jabez and Kaede, he was one of the witnesses to a near-crime by the Spanish during a reconnaissance mission in Raya.
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Kaede, Jabez, and Rinku's first appearance in the Atsuko: Origins vol. 1 manga
Rinku, puzzled because of Jabez
Rinku confronted by Jabez
Rinku, looking for Amata, but to no avail