Kei Takato

"You're my friend... Aren't you?" The person who rented me as a friend turned out to be dangerous...Note: The Official English release splits each chapter into 3 parts, for a total of 9 chapters in English.

Kirishima Ao encounters a collapsed woman on the street. Having learned CPR from his father, Ao rushes to her aid and does everything he can to help. Thanks to his actions, the woman survives—and her daughters turn out to be the strikingly beautiful twin sisters in his class, Kotobuki Yuzuki and Kotobuki Hikari. To express their gratitude, Yuzuki and Hikari begin searching for Ao. "I'll definitely make you fall for me." "I'll make sure you come to like me."

It has been several decades since dungeons made their appearance on Earth, bringing along rampant monsters. Due to the contamination of the mana caused by the dungeons, people gained powers called "skills", but it is not like the adventures that people see in tales and legends. Many towns were abandoned, the economy declined, and the world was filled with lawless areas, slowly inching towards extinction of the human race. In a ruined town where death is always around the corner, Amano Mamoru continued to hone his skills day and night. Together with the mysterious girl Shizuku, with whom he shares the same fate through the skill "Remaining Lives", and with his unique skill "Equivalent Exchange Store", he will challenge the world's coexisting dungeons!