On a rainy day, your daughter brings home a 6-year-old classmate named Tenko for a school project. After agreeing to let him stay for dinner, you, your husband, your 3 children and this guest sit at the table but you can't stop noticing how strange this child is. He always looks downwards and does not speak and has a cold expression and dull eyes as if he were a doll but even behind that lifeless face you can see a trace of sadness.