During work, she says, "Hey, you're slow at work!" But after work hours... "Thank you for your hard work today! I'm sorry I was so harsh on you earlier..." What!? My instructor as a new employee, Nitori-senpai, is super cute, has big breasts, and an amazing figure. But... she's really strict. I'm always getting scolded, so one day I had to work overtime with her. When we were alone... I can't believe it... she suddenly started acting sweet!? I'm scared of her during work... (crying) But she's sweet outside of work hours... (happy) That contrast makes me... almost cum (great) "I worked hard today, so as a reward... let's have sex?" Of course I do!!! [The cute big-breasted senior's 'tsun' and 'dere' drive a junior male crazy... an erotic tsundere drama]