Bob Hillfinger adores Nobuko. She scintillates with energy. She is frustrated with her career and admires him, who'd set himself free by walking out of a job. He, Euro-American who'd never been anywhere outside America and Europe, is suddenly enthralled by Japan. He is 40, she 26. And they just met in a castle in France.
After one night together--she doesn't seem eager but doesn't hesitate--she returns to Tokyo and he to Atlanta. Normally, for Bob, this would be it. But five months later, he travels to Australasia and Japan. In Tokyo, they become soul mates for two blissful nights a week and occasional weekends. The rest of the time, she is unavailable and he errs through the incomprehensible megalopolis he comes to love and dread.
One day she says that, before Bob's arrival, her trusted friend Kiso-san proposed a relationship leading to marriage and children. He even granted her a 90-day reprieve to accommodate Bob. She respects Kiso-san. She loves Bob. But Bob had a vasectomy and isn't Japanese. Love and marriage aren't linked in Japan, she tells him teary-eyed, and now his 90 days are up.
Reeling, Bob flies to Vietnam and floats without purpose and end across the wondrous lands of Eurasia, writing love letters to Nobuko because he isn't whole without her and because he knows life isn't fair, not even to Kiso-san, who has the best cards in his hand, except for an ace.
(Commercial Fiction, 142,000 words)
Some of this just doesn't make sense: "he errs through the incomprehensible megalopolis he comes to love and dread" for just one example.
I'm guessing English is a second language for you. You're obviously skilled but you'll need the help of some solid critique work before you need to worry about a hook. This isn't ready to send out.
And 142,000 words is twice as much as you'll want.