A Lying Novelist And His Fated One

Koutarou Izumi, a love story novelist, has a secret weapon for when he runs out of ideas: the bittersweet diary of his one-sided love for Takaaki Yamamoto, a classmate back in college. When a friend mentions to Koutarou that Takaaki's gotten married, he decides to try out a dating app in order to find a new love, to find new tropes for his novels... and to forget about Takaaki...
On his first date using the app, Koutarou's nervous walking to the meeting point, and who does he see there, waiting for him...!? This must be fate...

(Source: Renta!)

Note: Includes one extra chapter.