In their quest to build a rocket, Umika and her friends decide to visit Matataki, their classmate who is a skilled engineer, but doesn't attend classes. However, they soon find out that this mechanic's got one short fuse!
The key lies in the weight of the rocket, 
as well as the amount of water and air.
،ويكمن مفتاح ذلك في وزن الصّاروخ
.وكذلك في كمّيّة الماء والهواء
Das Gewicht des Objekts sowie die Wasser-
und Luftmengen sind wohl ausschlaggebend.
Pare i fattori chiave siano il peso del razzo
e la quantità di acqua e aria.
Parece que a chave é o peso do foguete,
e também a quantidade de água e ar.
Весь секрет в весе ракеты,
а также в объёме воды и воздуха.