I Became my Punk Son's Fake 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.

[From Steam]