

Who Is the Sender?
Season - Episode
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1 - 1Episode 1 Oct 11, 2022
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1 - 2Episode 2 Oct 12, 2022
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1 - 3Episode 3 Oct 13, 2022
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1 - 4Episode 4 Oct 14, 2022
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1 - 5Episode 5 Oct 18, 2022
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1 - 6Episode 6 Oct 19, 2022
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1 - 7Episode 7 Oct 20, 2022
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1 - 8Episode 8 Oct 21, 2022
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1 - 9Episode 9 Oct 25, 2022
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1 - 10Episode 10 Oct 26, 2022
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1 - 11Episode 11 Oct 27, 2022
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1 - 12Episode 12 Oct 28, 2022
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1 - 13Episode 13 Nov 01, 2022
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1 - 14Episode 14 Nov 02, 2022
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1 - 15Episode 15 Nov 03, 2022
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1 - 16Episode 16 Nov 04, 2022
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1 - 17Episode 17 Nov 08, 2022
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1 - 18Episode 18 Nov 09, 2022
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1 - 19Episode 19 Nov 10, 2022
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1 - 20Episode 20 Nov 11, 2022
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1 - 21Episode 21 Nov 15, 2022
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1 - 22Episode 22 Nov 16, 2022
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1 - 23Episode 23 Nov 17, 2022
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1 - 24Episode 24 Nov 18, 2022
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1 - 25Episode 25 Nov 22, 2022
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1 - 26Episode 26 Nov 23, 2022
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1 - 27Episode 27 Nov 24, 2022
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1 - 28Episode 28 Nov 25, 2022
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1 - 29Episode 29 Nov 29, 2022
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1 - 30Episode 30 Nov 30, 2022
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1 - 31Episode 31 Dec 01, 2022
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1 - 32Episode 32 Dec 02, 2022
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1 - 33Episode 33 Dec 06, 2022
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1 - 34Episode 34 Dec 07, 2022
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1 - 35Episode 35 Dec 08, 2022
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1 - 36Episode 36 Dec 09, 2022
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1 - 37Episode 37 Dec 13, 2022
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1 - 38Episode 38 Dec 14, 2022
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1 - 39Episode 39 Dec 15, 2022
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1 - 40Episode 40 Dec 16, 2022
Overview
Kuwazuru Mitsuki is a second year student at Arakawa Nishi High School. One day, her homeroom teacher, Tachibana, suddenly announces the start of the "Letter Game", where every student has to write a letter with his/her true feelings to each of the classmates. However, the "letter" will not include the sender's name. At first, there were a lot of bad jokes and silly "letters", but they slowly accelerate to revealing secrets and confessions, which make everyone question, "Who is the sender?" and "Who will be named next?" This game allows the students to become more aware of each other's hidden worries and thoughts, which slowly deepens the bond among the classmates. Meanwhile, Mitsuki tries to search for the sender of the letter sent to her and she discovers a secret hidden in this "letter game".