The protagonist has just been accepted into a university in Hokkaido, and in two weeks he’ll leave behind his familiar home town to commute there.

His father has been out of the country due to work, and he has been in charge of the house along with his step-sister. His impending departure has made him think about her in ways he never has before. And his step-sister, who has long had feelings for him, has become more proactive...

In just two short weeks many exciting stories will unfold between him, classmates, teachers, and the girl he admires. At the center of it all is his relationship with his step-sister.

[Translation of synopsis from Getchu.com]