Kimi to Tsuzuru Utakata by Yuama — Ongoing

Also known as Transient Spelling With You, Ephemeral Spelling With You, and The Summer You Were There

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Shizuku Hoshikawa, a high school girl who lives avoiding contact with people, writes a novel which is accidentally read by her classmate Kaori Asaka.
She loves it but finds out Hoshikawa wasn't planning to write anymore due to lack of ideas, to which she ends up saying:
"Let's start going out, you and me... You can write a story about our own love."

Volume 1
Chapter 1: Disappearing released Jun 20 '20
Chapter 2: Incomprehensible released Jun 23 '20
Chapter 3: At the Library released Jul 20 '20
Chapter 4: Seeds released Aug 21 '20
Chapter 5: Confession released Sep 25 '20
Volume 2
Chapter 6: Drowning in a Rain Shower released Nov 20 '20
Chapter 7: Memories released Dec 21 '20
Chapter 8: Opening the Seal released Feb 22 '21
Chapter 9: Facing Each Other released Mar 25 '21
Chapter 10: A Flash of Light released Jun 10 '21
Volume 3
Chapter 11: Name released Aug 7 '21
Chapter 12: Change released Aug 13 '21
Chapter 13: The Road There released Oct 7 '21
Chapter 14: Apology released Oct 7 '21
Chapter 15: You'll Be Fine, Right? released Dec 1 '21
Volume 4
Chapter 16: A Half-Gone You released Jan 25 '22
Chapter 17: Stark Naked released Feb 28 '22
Chapter 18: Recognition released Apr 18 '22
Chapter 19: Exposed released Jun 15 '22
Chapter 20: Little Sister released Aug 1 '22
Chapter 20.5: Volume 4 Extras released Sep 18 '22
Volume 5
Chapter 21: Shizuku and Shiori released Sep 18 '22
Chapter 22: Love released Sep 21 '22