Boku ga Aishita Subete no Kimi e
僕が愛したすべての君へ
Side Story
Because I'm Calling Your Name
Boku ga Kimi no Namae wo Yobu kara· 僕が君の名前を呼ぶから
novel
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Boku ga Kimi no Namae wo Yobu kara follows another version of Shiori Satou in another parallel world, which she begins to exchange diaries with her other self following her experience of Parallel Shift. (Source: Wikipedia)
Alternative
To Me, The One Who Loved You
Kimi o Aishita Hitori no Boku e· 君を愛したひとりの僕へ
novel
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From Seven Seas: In Koyomi Hidaka's world, travel between slightly different alternate universes is commonplace. After his parents' recent divorce, Koyomi lives with his father and falls in love with a girl named Sato Shiori when they meet at his father's workplace. But their young love seems doomed when their parents get remarried—to each other. Is there some parallel world out there where Koyomi and Shiori can be together as lovers, not step-siblings...and what could be the price if they try to find out?