Let's do it already.

Synopsis

Yuri and Keiichiro fell in love as they shared the same route to neighboring high schools every day. But it turns out Keiichiro comes from a prestigious family where his father and grandfather were both prime ministers. The family rules strictly forbids him from having any inappropriate relations with a woman until he turns 18. Can he resist Yuri's flirting?(Source: Shueisha, translated)