|Side Story Information|
|Characters on Cover|| Daiki Mamura|
|Collaboration With||Heroine Shikkaku|
Hirunaka Shikkaku (ひるなか失格, Hirunaka Shikkaku) is a side story of Hirunaka no Ryuusei and Heroine Shikkaku, and is a collaboration between the two mangaka who created the series, Mika Yamamori and Momoka Kouda. It is the first chapter released from the collaboration between the two, the second being Heroine no Ryuusei. It is not included in any of the Hirunaka no Ryuusei volumes, unlike Heroine no Ryuusei, which is included in volume 7. Instead, it was released in volume 1 of Sensei Kunshu, another manga by Momoka Kouda containing the Heroine Shikkaku characters.