High schooler Nozomi Koiwa wakes up and discovers she's lost her memories...and a whole lot of height. Now the size of a soda can, she flees from a feline assault into the disgusting den of Yume Okubo, a drunken shut-in NEET who's terrified of people and hasn't been outside for months. Between falling beer cans and deadly insect traps, Nozomi survives long enough to convince the airheaded Yume that she's a figment of her imagination who's come to save her from hitting rock bottom...all while investigating how she ended up funsized. But despite their differences-height, brains, and otherwise-each half of this quirky combo might just be what the other needs!