Pink haired seductress X serious teacher

Ryuunosuke is a tough grandpa with a beard and sunglasses. His innocent granddaughter Kotora has finally come over to his home!
His daughter who had left home,, came back hoping she could rely on him to look after Kotora, but everything Kotora asks for is unreasonable?
A popular work with lots of talk on social media! A Tough grandpa and an adorable granddaughter, won't there be many issues?

Hiroshiman boy Onijiro Otogi, and Russian girl Paulina are a newly-wed couple in their third year of high school. Together, they will learn about proper physical relations as they raid their high school life!