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Women - Women - New edition

Tatsuro Udagawa, age 27, a salesman in his sixth year with the company.
That night a year ago, his wife Chiaki left him with a note saying "goodbye.
He has been in a relationship with his colleague Kumiko for the past three months.
On the night of the first anniversary of their separation, celebrated by friends, in a room with memories of living with his wife,...... he came home one day to find his estranged wife naked...?!
Chiaki is being followed by an anonymous person.
What happened to Chiaki a year ago?
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Can someone tell me whats happening in this story?

Total 11 volumes. This is series based on bubble-era. I don't think it's attractive nowadays. I have some of Murao Mio's series.

Base +25