Riri Nanatsumori, A Beautiful Yankee Girl Who Saved Him, Fell In Love With Him... And He Returned The Favor By Nuking Her.

Yoshino is a dull salaryman living quietly in a suburban apartment. One day, a flashy, yankee-style gal named Riri moves into the next room. At first, Yoshino thinks she's a troublesome neighbor and consciously avoids her, but one day, he helps Riri who screams at a cockroach in her room, and their distance quickly closes. "...I'll repay you for all your kindness," Riri says, inviting herself into Yoshino's room. She starts hanging around constantly, acting tsundere while taking care of Yoshino and sometimes being clingy. And when Yoshino can no longer resist that gap, Riri spreads her pussy.