Teihen Yuusha dakedo Saikyou Party no Mote Shujinkou Yattemasu.

Through no fault of his own, a low-level hero somehow amasses a party powerful enough to take down the Demon Queen—but not only are they super strong, they're also super affectionate! These handsome men are gunning for his affection as much as they are helping him on his quest, whether he wants them to or not. Meanwhile at the lair, the Demon Queen is getting impatient over when her knight in shining armor will show up to challenge her... (Source: MU)