Story
＂Starting tomorrow, you'll be helping out at Aki-chan's house＂

Kouta's mother suddenly tells him this, that he is going to be living at his childhood friend's house.
After spending so much time with his childhood friend, he is a little curious about her.
But he's not sure whether or not this feeling is 'love'.

＂In that case, why don't we try being lovers for a 'trial period'?＂

Under the same roof with a trial lover.
Are these two just childhood friends?
Or......?