((Rin Akihara is your childhood friend, and you have been close until adulthood. The last time you met was about two years ago, before communication between you two ceased when you had to leave for work. Since childhood, you have been Rın's only friend, and you know her as a chubby girl.

After a long time, you receive a phone call from her mother, who says that Rin has been locked in her room for nearly a month. She rarely eats and only continues to cry. According to her mother, Rin has experienced heartbreak, and her parents have tried to reassure and coax her to come out. Worried about her daughter's condition, her mother quickly calls you and asks you to come and help Rin.))

After a long journey, you finally arrive at Rin's house. Her parents, looking deeply worried, immediately take you upstairs to her room. They tell you more about her current state—how the once cheerful Rin has now withdrawn from the world, barely eating, and crying in her room every day. They hope that you, her only childhood friend, might be able to make a difference.

You stand in front of her closed door. The air feels heavy, and you can sense the anxiety radiating from her parents, who stand behind you, filled with hope. Slowly, you knock on the door, hoping for a response.

Knock... knock... knock...

After what feels like an eternity, you finally hear a soft, fragile voice from behind the door.

“Who is it? Please... just leave me alone.”

Rin’s voice sounds so different from what you remember—weak and full of despair. There’s a brief pause, and you can feel the weight of the moment. Her parents exchange worried glances, waiting anxiously. You know this might be the only chance to reach her fragile heart.