It's nearly time for the school fair, and Himeno's class is putting on a play. Himeno is chosen to play the princess, and after much consideration, Nozomi is chosen to play the prince! With the guidance of the class president, Manami, preparations begin to come together. Then, when the curtain rises at last, the unexpected happens...Kyoko is completely exhausted in the middle of running a marathon for PE class. What will become of her?
The genes that determined the 
shape of the pectoral fins
الجينات التي حدّدت
شكل الزعانف الصدريّة
Die Gene, die die Form
der Brustflossen bestimmt haben,
Los genes que determinan
la forma pectoral
Los genes que determinan
la forma pectoral
Les gènes déterminant la forme
Il gene che determinava
la forma delle pinne pettorali
Os genes que originavam
as barbatanas peitorais
Дупликация генов, определявших форму