It must be nice to be an android. Something you don't know? Simply install it. Masato isn't an android, but his neighbor is, and he has been entrusted with looking after it. The android known as Koto Nakahara appears to be almost identical to a human, but if she goes without water, her fuel source, for too long... she could explode! With tests looming over, will Masato be able to study for his exams and be able to keep an eye on Koto the android?