Reika Inukai

Haruma's friend and crush since their high school days. He's long suppressed his feelings for her once she started going out with Shuuji, but has continued to keep in touch with the couple long into adulthood. After Shuuji's death, she moved in with Haruma so the latter could support her through her pregnancy.

It is revealed that Shuuji is not the father of the baby Reika is carrying, but in fact Haruma, who in a moment of weakness slept with Reika the night after attending Shuuji's funeral, upon her invitation. However, due to his amnesia, Haruma himself can't seem to remember these events transpiring and obliviously goes on assuming Shuuji's fatherhood for the majority of the story.