High school student Yuta Asamura finds himself living under the same roof with his father Taiichi's new wife and her daughter Saiki Aya from a previous marriage. Both Yuta and Saiki have experienced their parents' divorce and strained relationships, so they agree to maintain a proper distance as step-siblings due to their cautious approach to romantic relationships.
"We shouldn't expect anything from each other since we don't want to be disappointed," they express their thoughts, gradually understanding each other through conversations and compromises.
As they begin to feel comfortable in their new life, their relationship slowly but steadily starts to change... - Official site