Kono Yo wa Tatakau Kachi ga Aru

Kiri Ito has been working for three years.
Full of negative energy, with an unfulfilling job, a sexually harrasing boss, and an unfaithful boyfriend.
Just as the office lady was reaching the end of her rope, she receives a letter...
At 25 years old, it is time for a new reckoning on life.

(Source: Big Comic Bros, translated)