企画・原案：秋元康による青春ヒューマンミステリー！突然始まった“手紙ゲーム”によって暴かれていく生徒たちの秘密…差出人は誰？5500名から選ばれた幸澤沙良主演！
Native Title: Sashidashinin wa, Daredesuka?
Also Known As: Who Is the Sender?
Screenwriter: Tomori Atsuki, Fujihira Hisako
Director: Kumasaka Izuru
Genres: Mystery, Youth, Drama
Tags: Classmates’ Relationship, Teenager Supporting Character, Teenager Female Lead, Short Length Series, Secret Crush, High School, Student, Investigation, School, Friendship
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