Ramen Ikaga!?(1997)

Ramen Ikaga!?

When Sumire, a high schooler, buys a bowl of ramen for dinner, and pours hot water into it, the prince of the Cup-Ramen planet pops out! On his planet, pouring hot water on someone is a way of proposing marriage... What will become of this average high-schooler now that he has accidentally proposed to this guy?! (Source: youhiguri.com)