"I promised, after all... Alright, it's a date!" A man falls for a naturally slender girl he meets at the gym. They agree to go on a date once she successfully loses weight, and after she reaches her goal, they finally go out. The date unfolds at her own pace, packed with various activities, forcing him to constantly keep up with her rhythm. However, touched by his sincere feelings, she gives herself to him completely, leading to their first time together in a hotel. This heartwarming story portrays a pure, natural romance where her innocent personality and his genuine affection intertwine.