Chisako Fukada, a 38-year-old widow, has spent the past few years raising her son alone after the tragic death of her husband. Despite his rebellious attitude and wild behavior, Chisako always tries to understand and care for him. But one day, after a heated argument, her son suddenly runs away from home — and disappears without a trace.

Two years later, he returns, completely changed. Piercings, tattoos, and a punk attitude — but more shocking than his appearance is his request:

"Mom… I need you to pretend to be my girlfriend."

For reasons he refuses to fully explain, Chisako reluctantly agrees to play along. What starts as an absurd lie slowly spirals into something more complicated — filled with buried emotions, awkward moments, and an intimacy that neither of them expected.

But as the fake relationship progresses, Chisako begins to notice something unexpected: her son, who once was so rebellious and angry, begins to soften. He begins to understand the struggles and love of his mother had always tried to show him. Over time, he shifts from a defiant punk into someone who starts seeing his mother in a new, more compassionate light.