Sakurako-san holds back from revealing more about it’s titular character’s central mystery, while hinting at some similar themes that drove whatever it was that happened. The wonderful Yuriko returns, who bumps into Saku and Shou at the pastry shop and solicits the detective’s help in determining which painting her departed grandmother would have chosen to give her on the occasion of her wedding. Note that Yuriko isn’t actually getting married (though let’s not forget that Saku is technically betrothed).
What follows is a wonderful train of thought as Sakurako explains the choices she made based on the information she knows. Her best bet for Yuriko is a painting of Kamuishu Island, which means “God-Grandmother” in Ainu. Sakurako refers to the story that the island is actually the remains of a grandmother who collapsed looking for her lost grandson. Her body gave out, but her spirit never will.
Sakurako believes it’s best because it reflects Yuriko’s grandmother’s desire to always watch over her with love, while dismissing the whole painting enterprise as “pointless sentimentalism” she claims not to understand. Shoutarou chastens her after a fashion, telling her some things have value because they are pointless.
That’s a remark that Sakurako is able to return to Shoutarou, when the young lad pays her a visit on a rainy day with the gift of several flavors of his favorite brand of pudding, embarrassed both Saku and her Gran laugh at the oversized clothes he has to borrow to dry off, but well aware of Saku’s well-honed sweet tooth.
Like Yuriko’s story, Shou reminices about his grandmother, who in his case was dying of bone cancer. He recalls coming to visit her in the hospital, and how she’d always ask him to pick up pudding beforehand, which perplexes him, because she never liked the stuff before. But Saku’s Gran figures it out even before Saku. No surprise there, since her life experience more closely matches Shou’s gran.
While Yuriko’s mystery involved which painting would bring her closer to her gran, Shou’s mystery of why her gran wanted pudding for their visits is solved by taking both what is known about the subject and what one’s own wisdom and experience provides. Gran and Saku settle on the notion that Shou’s gran asked him to buy pudding because it would allow her painkiller injection time to kick in before he arrived.
Just as Yuriko’s happiness was her gran’s happiness, so too was Shou’s. Shou’s gran left this world on her own terms, spending time with someone she loved. Shou can’t initially fathom how his presence at his grandmother’s bed did any good or had any point, until Saku repeats his line about pointless things having their own value.
Saku’s detective skills can’t help but notice her own gran’s back is ailing, and tells her they’re going to the hospital. But that ain’t happening; her gran, like all the other grans before her, aren’t going to be pushed around by youngins. Speaking of gran, she seems to be aware of Saku’s deep dark secret, and the significance of Shou’s name.
As for Sakurako, she seems to have gotten quite a bit of something pointless yet valuable from Shoutarou, but makes mention of bringing it all to an end, which this show has to do soon. The “cold ending”, if you will, does not do much to clear up her mystery, as we watch a girl who looks similar to Saku but whose name is Hitoe tighten up her boots and head out as her parents loudly argue about her, and she looks at the moon and momentarily grows butterfly wings as she tells her “sensei” she’ll “fly up to him.”
I have no earthly idea what any of this is about, only wild speculation, but as usual, I’m interested to learn the truth.