泣き虫O'clock (Nakimushi O'clock) is a mid-tempo pop song created for the maimai series by composer Hiro (Hiroshi Kawaguchi), with lyrics by Miwako Hotate and vocals by Yuka (友香). Released as part of the maimai PLUS update on May 9, 2013, the track stands as one of the few Hiro compositions in the maimai catalog to feature an external arranger, guitarist and arranger Arata Hiramatsu handled the arrangement, a deliberate departure from Hiro's usual in-house production approach that he made to expand his creative process for the maimai project. The title translates to "Crybaby O'clock," and the lyrics paint a quiet, nostalgic morning, an alarm that stings the ears, the scent of something familiar carried by the cold wind, and a murmured "Are you doing well?" directed at the sky. Musically, the song blends a techno-synth foundation with crisp guitar accents at key structural points, written at 152 BPM with the explicit goal of evoking an anime ending theme, a sensibility Hiro himself cited in his artist commentary. Yuka's vocal performance balances a gentle sweetness with fuller, punchier moments in the catchy chorus refrain. The song's jacket was updated for the maimai でらっくす era, and its original animated PV, which featured a watercolor-style personified illustration of the maimai mascot, was replaced with a static image of the new jacket. An extended version, "泣き虫O'clock (full ver)," appears on the album "Hiro 30th Anniversary Album Thank you for listening!". Within the arcade series, the song has undergone multiple level adjustments across version updates, reflecting the evolving difficulty benchmarks of the maimai line.