July 1, 2020. Mizuho, a high school sophomore, was having the worst 17th birthday. She had no chance to get closer to the senior she admired, and her parents had completely forgotten about her birthday... Moreover, due to the outbreak of an unknown infectious disease, club competitions and school trips were canceled, and she thought, "I don't have a sparkling youth." But just then, her childhood friend, Kizuki, suddenly declared that he was a potential boyfriend. A school youth story depicting the love affairs between the protagonist Mizuho and the four childhood friends who grew up like family.