What He Who Doesn't Believe in Fate Says Vol. 3 (manga)

Yuka had been waiting for her true love for twenty-six years. She’s never had a boyfriend in her entire life. No one she meets at work or single mixers who feels like the One. Her best friend, Fuji, is the only guy she can confide in. But one morning “the red thread of fate” appears before Yuka’s eyes. It’s tied to her pinky and leads to... Fuji?!