A former classmate I hated
I became a naughty older brother

Hirose, the heir of a large company, joins a cosmetics company mid-career because he wants to compete with his abilities.
However, his ambitions were in vain, and he was living a smoldering life.
Meanwhile, he meets Adachi, his high school classmate and club clubmate, at work.
Adachi was appointed vice president of a construction company at a young age and was highly trusted by his subordinates.
He was still the perfect man.

Hirose has hated Adachi for a long time.
Now that he has become a business partner, Hirose wants to somehow gain traction, but...

“Why is this guy so sick!?”
On the verge of falling into the best anime!!!