In April 2020, as the COVID-19 pandemic forces Tokyo into a state of emergency, high school student Mizuho Nagisa prepares to celebrate her seventeenth birthday. She has been close friends with four boys since childhood: the gentle and popular Kizuki Irie, the cool and athletic Sora Yanagi, the cheerful and artistic Shin Kikuchi, and the quiet but kind Chihiro Mochizuki. On her birthday, she receives a heartfelt confession from one of them, but before she can respond, the city locks down and school is suspended indefinitely. Confined to their homes and separated by social distancing, the group’s easygoing dynamic begins to shift. Mizuho finds herself caught between her growing awareness of each boy’s feelings and her own confusion about what love really means. As months pass and the world adapts to masks, remote classes, and canceled festivals, the friends struggle to maintain their bonds. The story unfolds through seasons marked by missed chances, silent longings, and small moments of closeness—a shared umbrella in the rain, a late-night text, a glimpse from across a nearly empty train. Key narrative arcs include Mizuho’s internal journey as she confronts her own heart, the rivalry and unspoken tensions among the four boys, and the impact of the pandemic on teenage romance, from postponed confessions to the fear of losing touch entirely. The series explores how a global crisis reshapes first love, forcing each character to decide what they are willing to risk and reveal before the world returns to a normal that may no longer fit them.