Yuuto Tanaka has one rule: never smile.
After losing his younger sister, he shuts the world out and becomes "the boy who refuses to be happy." Cold, distant, and impossible to approach-Yuuto has no intention of changing.
Then comes Saki Mori, the bright, stubborn classmate who refuses to leave him alone.
When their homeroom teacher pairs them for a year-long emotional wellbeing project, Saki proposes an outrageous idea:
"Let's sign a contract. For one year, I'll make you smile. In return... you help me learn how to be strong."
Dragged into Saki's world of rooftop sunsets, after-school talks, unspoken pain, and unexpected warmth, Yuuto slowly begins to confront the trauma he has buried for years.
But Saki has her own secrets-ones that could break the fragile happiness they are building together.
As the seasons change, their "contract" becomes something deeper, something dangerous... something real.
And Yuuto must face a choice he never thought he'd make:
protect his heart, or open it and risk losing everything again.
A tender, emotional, and heart-warming Young Adult contemporary romance, Our Contract to Be Cheerful explores grief, healing, friendship, and the courage it takes to smile again.