WATASHI NO OSHI GA KYOU MO SAIKOU NI TOUTOI NO DE, ZENRYOKU DE SHIAWASE NI SURU! (MANGA)

Description

The happiness of my favorite is my happiness―― Only my favorite can win!!!

Rize, a druggist who was a marginal otaku in her previous life,
One day, I found my favorite character, Mair, the son of a duke, collapsed on the street, and realized that this world was a world of maiden games!
And while taking care of him, who doesn't seem happy at all, she makes a decision. "I will make Mare the happiest in the world!!"
As things turn out, I start living with my Oshi, but... my Oshi is so precious that I can't hold my heart!
What's more, I, a mobster, have become Mare-sama's temporary fiancée!?
A love comedy about a girl who loves her boyfriend with all her might and is overwhelmed by his preciousness, only to be surrounded by him!