Kimi o Aishita Hitori no Boku e
君を愛したひとりの僕へ
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 Every You I’ve Loved Before
Boku ga Aishita Subete no Kimi e· 僕が愛したすべての君へ
novel
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In a world where people regularly travel between slightly different parallel universes, Koyomi Takasaki lives with his mother after his parents' recent divorce. Awkward and studious, he has trouble making friends at his new school, until his classmate Kazune Takigawa seeks him out. She claims that she's moved here from another world where she and Takasaki are lovers but could he be the one who's actually from a parallel world? Source: Seven Seas Entertainment