A childhood friend of Usagi and his great love. However, she married Kenichi after Usagi left to become a samurai with Lord Mifune, but not before Usagi and she had an impulsive tryst that produced a son, Jotaro. Kenichi married her with full knowledge of her illegitimate pregnancy while Usagi was not informed of the situation as to avoid him abandoning his post for her. Eventually, Mariko told Usagi about Jotaro and insisted he leave the village when he returned to stay, although brief future visits were permitted. Later on, she told Jotaro about his biological father, but for some reason did not mention that Usagi knew the truth himself. Despite the fact she still harbors feelings for Usagi, she realizes her place is with Kenichi.