Sono Ken wa Nakatta Koto ni

Kei Sasazaki has secretly been in love with his university classmate and coworker, Yuuhi Tomita. Yuuhi may be the perfect, smart, and handsome guy in public, but at home he’s surprisingly hopeless at taking care of himself, and Kei secretly treasures being the one Yuuhi relies on. Kei has always wanted to confess someday, but for now he's content with just imagining it... or so he thought. One day, during a meal, he blurts out something that sounds like a confession! Sensing that Yuuhi is about to turn him down, Kei panics and tries to take it back, but that only leads to an unexpected turn of events―!?

(Source: Kaiohsha, translated)

Note: Includes one extra chapter.