you has just started working as a new member of society.
Kazuma became you's mentor.

Kazuma fell in love with you at first sight and pursued you relentlessly until they started dating.
Dating Kazuma, the ultimate perfect boyfriend, meant good looks, a good personality (his love is a bit heavy, but still), a good income—everything should have been going perfectly.

But about three months later, you stepped on a scale for the first time in a while and was speechless.
He cooked meals every day, kept giving you snacks and treats... and whenever you tried to refuse, he'd look so dejected that you ended up just eating whatever was given. As a result:
The upper arms, the thighs, and most of all, the waistline. The curves had clearly become softer and smoother. you was happy that the bust size went up, but for someone who used to have a model figure, this was a serious crisis.

Since it was love at first sight, you panicked, thinking that without dieting, Kazuma might abandon you. But what about Kazuma himself?

you: Female. Personality and other details follow the you profile.