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The flashback highlights Kou's long-standing tendency to "go with the flow" and his deep loyalty to Mahiru, contrasting with the more rigid expectations placed on them by the adult world.

Explain into a "half-vampire" later in the story. The flashback highlights Kou's long-standing tendency to "go

Youth, the complexities of friendship, and the desire to escape social pressures. Mahiru faces intense pressure from his mother and

Mahiru faces intense pressure from his mother and initially decides not to attend the upcoming school field trip. Upon hearing this, Kou decides he won't go either, stating that "if [Mahiru's] not going," there is no reason for him to go. Chapter 133 Summary: "If I'm Gonna Go" Instead

In Chapter 133 of the manga (Japanese: Yofukashi no Uta ), titled "If I'm Gonna Go" (行くなら, Iku Nara ), the story shifts focus to a nostalgic flashback of the childhood friendship between Kou Yamori and Mahiru Seki . Chapter 133 Summary: "If I'm Gonna Go"

Instead of attending the school event, the two spend their time together in a "prolonged sleepover" style, engaging in "non-daily" activities like playing video games for hours on end until they complete them.