Hiru wa Baito Leader, Yoru wa Spy no Ojisan ga JK ni Utagawareru Hanashi

Urasaburo Fujiyoshi is a brilliant spy who has traveled all over the world. But now he has been targetted by the legendary assassin "RED", so he is hiding out as a part-time manager at a convenience store in rural Hokkaido until the situation cools down. However, the high school girl working at the convenience store, Akiko Karakohi, keeps asking Fujiyoshi about his past. Fujiyoshi suspects that she might be the assassin "RED" who is after him...? A life-threatening romantic comedy begins! (Source: Kurage Bunch, translated)