Koutarou was Rinko's former colleague when they worked as traveling biologists. He was present when they discovered a Kaiju skeleton and witnessed Rinko deciding to take an egg home, swearing him to secrecy. Although he disapproves of Rinko's methods in raising Kuroe, he behaves like a protective uncle to her, leading Arata to mistakenly assume he is her boyfriend at one point. Koutarou has since begun working for the Japanese government, a move that has alarmed Rinko, who simply wants Kuroe and her newly hatched sibling to be happy.
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