This is a rather faithful "hot spring situation" work, where the heroine and male lead go to a hot spring together, and end up having to stay in the same room, where their relationship progresses quickly.
There is always someone out there that will love you for you! This time, the theme is "chubby". A story of love between you and the man you won over through his stomach.
Once a month or so, you stop by Sui's place. You want to know how he feels about you, so you lie and tell him you have a date. He gets so jealous that your words no longer reach him, and...