Aka：Seven Sisters / Тайна 7 сестер / Сім сестер / Siete hermanas / Sete Irmãs / Onde Está Segunda? / Τι Συνέβη στη Δευτέρα / ¿Qué le pasó a Lunes? / 猎杀星期一 / Какво стана с Понеделник? / 獵殺星期一 / 월요일이 사라졌다 / Yedinci Hayat / Siedem sióstr / Hét nővér / 7 životů / セブン・シスターズ / Septiņu māsu noslēpums / מה קרה ביום שני / 7 เป็น 7 ตาย / Тајна броја седам / Șapte surori / Septynios seserys / 7 soeurs / 7 sestier / Skrivnost številke 7 / Chuyện Gì Xảy Ra Với Thứ Hai / სად წავიდა ორშაბათი? / Tajna broja sedam
Summary：In a world where families are limited to one child due to overpopulation, a set of identical septuplets must avoid being put to a long sleep by the government and dangerous infighting while investigating the disappearance of one of their own.
