Border of her Heart is a VN about a town that recently had plague outbreak. With the quarantine lifted, you are tasked to work on the morning shift at the border and choosing who gets to enter or not. Because of the recent epidemic, you are short on both supplies and manpowers and have to pick only the best candidate and have to make choices who you let in. But beware, as not everyone is who they claim...

This is a game where you guard the border gate that leads to a town. People want to enter, some want to leave. You can only let in two people each day but some special events may change this. After each work day, you can socialize with the people that are inside and pursue relationships. Some of the characters have multiple outfits.