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Turns out her mother was essentially correct. Midori disregards this notion (which, to be fair, at this point comes out of superstition).
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The boys also work as foils to each other and their personality differences highlight their upbringings: Ryusei is a more obviously social, free-spirited boy, while Keita is comparably much more polite and well-behaved.For Ryota and Midori, however, especially the former, the reveal that Keita isn't biologically theirs is a big blow. The way both couples react to the whole situation is also filled with nuanced contrast: Yukari and Yudai, a working-class couple portrayed as more emotionally connected with their children, are of course troubled by the news that their son isn't biologically theirs and are willing to "exchange" Keita and Ryusei for a while, but it's clear that they consider Ryusei their son to the point that it doesn't matter that much to them they seem more interested in getting some money as reparation from the hospital for the whole ordeal, and possibly getting to know Keita better, than anything else. The latter are wealthy but are new when it comes to parenting, while the former lack money but are experienced parents (having two other kids). The parents, Yukari/Yudai and Ryota/Midori.Family of Choice: One of the driving questions in the story is seeing if family can be one through blood or bonds.Cherry Blossoms: One scene has both couples and Keita in spring walking through a park lined with cherry trees.Central Theme: Is family defined by blood or by bonds?.The latter hesitates for a while before answering "yes".
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Armor-Piercing Question: When Keito asks Ryota if his new parents love him more than Ryota.
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