Damedol to Sekai ni 1-ri dake no Fan

"Urumin" is an idol, but she doesn't sing or dance all that well, and she's not very honest with her feelings. Kimiya is her only fan in the world. The relationship between the two of them goes a little beyond the usual fan-idol interactions! This is a "precious" love comedy that depicts the daily life of an unpopular idol, and the man who keeps on trying to promote her as his way to show her his love!

(Source: Ganma!, translated)