With Oyanagi-san.

Koudai, heartbroken and single after being coldly dumped by his older girlfriend of three years from a office romance, finds himself wandering into a bar he’s never been to before after being abandoned by his colleagues who’ve grown tired of his complaints.

"You’ve got such a gloomy face. Hey, how about having a drink with me?"

The one who calls out to him is Oyanagi-san—a petite, energetic woman far smaller than the tall Koudai. Turns out, she's been cheated on and dumped by her boyfriend.

Bonding over their shared heartbreak, the two hit it off instantly and end up spending a single night together—

(Source: DASH X Bunko, translated)