Mariko Sakai /

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About : Sana's little sister, who is Keiko's daughter. She appears in a total of four pages, but also on the cover of the final book. She is a fan of Sana, not knowing that Sana is her older sister. After meeting Keiko, Sana spends one day having fun at a theme park with Akito, Tsuyoshi and Mariko. Although Sana enjoys her day with Mariko, she realizes that she doesn't feel a familial bond with her or Keiko. Episode 023 of the anime is dedicated to Mariko, where she wanders off to see Sana when a remote...