One day, Yone-kun, a typical young man, encountered an odd creature. It appeared jelly-like, watery, slimy, mushy, and enigmatic. Was it an extraterrestrial invader, or a mischievous being attacking people to do naughty things with them? A heartwarming tale unfolds as they begin living together, unaware of its true nature. (Transalate by Halo-RedFrog)