Sumi's older brother, who has a terrible problem with gambling; Any money he makes, he ends up wasting rather than than using it for his siblings or for paying rent. He gets a job at Soichiro's company and does manage to pay 10 years worth of the bills however. It is later revealed that Eisuke brings home so many abandoned children to Sumi because she once asked for more siblings, though she herself doesn't remember this. He tells everyone that Sumi is his little sister, causing him to lose all his money and bring Soichiro to poverty. It is revealed that Sumi and Eisuke are not really related; he found her in a rose garden as a baby and brought her up as his sister.

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