Arata Kouda's first year of junior high brings an unexpected houseguest: a peculiar creature called Kujima who simply appears one day and decides the Kouda household is now home. The family's atmosphere has grown heavy with worry over their eldest son's college entrance exam preparations, but Kujima doesn't seem to notice or care about the tension. This strange being speaks fluent Japanese, shares meals with the family, and treats their home like it owns the place, which it apparently does now. Where Kujima came from remains a complete mystery. Outer space? Some forgotten corner of the forest? The creature isn't saying. What matters is that daily life has become thoroughly chaotic and oddly hilarious. Between Kujima's bizarre antics, the eldest son's exam stress, and a perfectly normal family trying to adapt to housing an entity that defies all explanation, the Kouda household transforms into a circus of unexpected warmth. Comedy emerges not from punchlines but from the collision of the mundane and the absurd, where a family learns that sometimes the weirdest additions create the strongest bonds.