あいすのっ!

"The only thing that I want to be here in winter is Santa Claus, but I got this instead...?"

Tada Tomokazu - the protagonist, who received a proposal along with a slap, muttered so.

A mysterious dream that he has every time winter comes.
Akino Saki, a beautiful girl who suddenly made her appearance.
Saki has the worst impression ever in his eyes, and the same thing goes for her. 
As Tomokazu tries to follow the conversation, the girl seems to know him, but he has no memory about her whatsoever...

Will the protagonist be able to settle everything, by the time the snow thaws?

official site