Mimoza's grandfather was worried about her until the time of his death. Before he dies he tells her that since she was too vulnerable and easily lied to by everyone to never trust people. He also leaves behind Kyle, a robot, to protect her from others. Thanks to Kyle, Mimoza no longer feels alone. But will she ever discover the secret this robot hides?

From Impossibility:

This is the story of four high-school students whose family name happens to be Kobayashi that end up in the same class. No Kobayashi is similar to another Kobayashi and in fact, three of them are considered something similar to the Bermuda triangle. Anybody who gets near, ends up... well... that's better left unsaid.

New student Kobayashi Yamato is not afraid however, and already considers them like brothers and sister! Will his naive youthfulness be crushed forever? Will the everlasting power of "always happy attitude" overpower the famous trio? Will anybody survive the year?