The story moves on to a new stage──half a year has passed since the release of "POP IN 2." Thanks to Mem-cho's hard work, B-Komachi are on the verge of their big break. Aqua continues to grow as a personality, while Akane advances on her path to becoming a skilled actress. Meanwhile, Kana has lost her usual cheerfulness. Finally, in her quest to uncover the truth behind Ai and Gorou's deaths, Ruby rises through the entertainment industry—using lies as her weapon.

When Lizel mysteriously finds himself in a city that bears odd similarities to his own but clearly isn't, he quickly comes to terms with the unlikely truth: this is an entirely different world. Even so, laid-back Lizel isn't the type to panic. He immediately sets out to learn more about this strange place, and to help him do so, hires a seasoned adventurer named Gil as his tour guide and protector. Until he's able to find a way home, Lizel figures this is a perfect opportunity to explore a new way of life adventuring as part of a guild. After all, he's sure he'll go home eventually... might as well enjoy the otherworldly vacation for now!

Yuki wakes up to find herself in an unfamiliar manor, wearing a maid uniform and lying on a luxurious bed. Soon, she discovers five more girls, all dressed the same as her. This is the Ghost House, and the only way they can survive is to make it through the traps that lie in wait—deadly games full of blowguns, buzz saws, locked rooms, and weapons. It's a hopeless, terrifying situation for everyone there...well, everyone except Yuki. After all, this is her career at seventeen. Do you think that's odd? She would agree. But that's how some people are—they earn their living playing death games.

This story is about Shinonome Hajime, an adventurer of Silver Range. He's dedicated to fulfilling missions from the guild. One day when completing a quest for monster meat, he finds a strange girl named Lily in a dungeon who's far more trouble than she's worth. Saving the girl from certain death, her story reminds him of his similar past and he takes her under his care...