Worst Soulmate Ever: Proposal

Impatient 29-year-old omega Shishikura has watched all his friends get married while his own romances keep fizzling out. Sparks fly when he starts up an enemies-with-benefits relationship with his alpha coworker Kotani. Despite the clash of their difficult personalities, their romance is undeniable, and the two begin dating. But when Shishikura brings up his desire to get married, Kotani refuses! Shishikura will have to get to the bottom of Kotani’s deep-seated issues about omegas before there can be any happily ever after.

(Source: SuBLime)

Note: Includes "Unmei no Tsugai to Onsen Ryokou da Nante" (運命の番と温泉旅行だなんて, Worst Hot Springs Trip Ever) and an extra chapter.