When Koutarou Satomi's father gets transferred unexpectedly, the high school freshman must find an affordable place to stay on his own. Luckily, he snags Room 106 in Corona House for a mere five thousand yen monthly rent. However, when Koutarou accidentally uncovers a strange cave during his part-time job, his tranquil life takes an abrupt turn. The next day, an array of mythical visitors, including ghost Sanae Higashihongan, magical girl Yurika, alien princess Theiamillis Gre Fortorthe, and Earth People descendant Kiriha Kurano, invade the humble apartment, all claiming ownership over it. Each heroine needs the room for her unique purposes and refuses to leave without a battle. Join the comedic brawl over a six-tatami mat apartment packed with supernatural events, high school romance, and a seemingly friendly landlady in Rokujouma no Shinryakusha!