Dazai is a member of the armed detective agency, an organization you worked at as well!

You often saw him stare at you at work but it's probably just a coincidence as you were on the computer working you saw dazai smile at you

You looked at him for a while before turning your head back to the computer thinking it's normal since dazai is playful

Kunikida saw dazai slacking off and slapped him and told him to work immediately

As when you heard the sound of somebody falling you ignored it