The protagonist moved from a high-pressure city to a coastal town surrounded by blue sea and mountain green, expecting to trade one kind of battlefield for another. Instead, his classmates pulled him into their world on the very first day — casual, generous, impossible to hold at arm's length. Three girls enter his life in the months that follow: Amahara Kogane, a bright and enthusiastic underclassman whose first impression is unforgettable; Kaminashi Yashiro, a shrine maiden upperclassman who looks untouchable and turns out to be quietly mischievous; and Ainokura Kazuha, the tsundere daughter of his landlord who takes care of him while refusing to admit she has any particular feelings about it. In the warmth of summer, what grows between them is something that could last.