Nanase-kun wa Ubu ja Nai.

Hazuki (26 years old) works in the apparel industry. She loves her job, but her lack of experience in love is a complex... She was beginning to feel discouraged by the cold attitude of new employee Nanase, but an unexpected turn of events awaits her...!? "You're getting excited like that... so cute," she says, as she begins a "non-innocent adult romance" with a younger boy who is surprisingly aggressive♡.

(Source: Kodansha, translated)