Alice's Suitcase is a crossover song that originated in lowiro's mobile rhythm game Arcaea before arriving in maimai DX FESTiVAL as part of a cross-title collaboration. The track is the work of Endorfin., the music circle fronted by composer sky_delta, and was Endorfin.'s first contribution to the Arcaea song library, included in the paid "Ephemeral Page" pack. Sky_delta handled composition, arrangement, and lyrics, while the vocals were performed by Nakuru Aitsuki (藍月なくる), lending the song a bright, airy energy that matches its storybook title. At 190 BPM, Alice's Suitcase moves at a brisk clip, with lyrics that weave card-suit symbols (♠♣♥♦) into playful verses about an accelerating dream journey, fantastical tea parties, and the feeling of chasing a world just beyond reach. The imagery draws on playing-card and fairy-tale motifs that evoke the whimsical, slightly surreal atmosphere its name suggests, a suitcase full of Alice-in-Wonderland curiosities. In maimai, the song debuted on March 2, 2023 across all regions. Its MASTER chart (level 13+, constant 13.7) was co-designed by Jack and あまくちジンジャー (Amakuchi Ginger) in a rare collaborative credit format, "Jack vs あまくちジンジャー", that signals a competitive or complementary approach between two noted chart designers. The EXPERT chart was designed by PG-NAKAGAWA. Beyond maimai, Alice's Suitcase also appears in SEGA's ONGEKI bright MEMORY and CHUNITHM SUN, and an extended version (alongside an instrumental) is available on Endorfin.'s 2021 album モノローグ・オフ (Monologue Off).