"I don't know how to write a love letter."

In a society where one's "fated partner" is notified by the government, the Hatta brothers—who are twins and became husbands—were already flirting and acting lovey-dovey before receiving their notification. However, upon realizing they were each other's "fated partner," they became embarrassed for some reason. Determined to fix this, the younger brother Kanade decides to use the school festival's confession event to convey his feelings to his older brother Hibiki. ※Cross-posted on other submission sites.