宿題が終わらないっ！ (Shukudai ga Owaranai!, meaning "The Homework Won't Finish!") is a Touhou Project arrange song by the doujin music circle Innocent Key, featuring vocalists Yuri Nashimoto, JUNCA, Mao Komiya, Shion Itsuki, and Ai Ohsera. The track debuted in maimai MURASAKi PLUS on June 22, 2017, and has remained in rotation through subsequent version updates. Originally released on Innocent Key's 2009 album 東方サマーバケーション (Touhou Summer Vacation), the song is built around ZUN's original compositions, primarily 竹取飛翔 ～ Lunatic Princess from 東方永夜抄, with segments of おてんば恋娘 and 妖魔夜行 from 東方紅魔郷 woven into the arrangement. Yuuma Mizonokuchi (溝口ゆうま) handled the arrangement and co-wrote the lyrics with gak. Each vocalist performs as a distinct Touhou character: Nashimoto as Kaguya, JUNCA as Mokou, Komiya as Cirno, Itsuki as Sakuya, and Ohsera as Rumia, a casting choice that mirrors the song's playful premise of students panicking over unfinished summer homework. The music video, created by the doujin circle 迷走ポタージュ (Meisou Potage), is densely packed with anime and game references, rewarding repeat viewings. On the charting side, the MASTER chart was designed by 如月ゆかり (Yukari Kisaragi) and the EXPERT chart by rioN. The MASTER difficulty has seen multiple upward level revisions across maimai versions, from 11+ at launch, rising through 12 to its current 12+, affirming its reputation as a demanding chart in the Touhou Project song lineup.