Hero Murasawa Itsuki that suffer from the infested tentacles organisms in the body.
But she had come to coexist and share a part of the organism and the spirit.
Such folding, becomes the timer nurses and Kamisho and combat that appeared for the tentacles biological extermination, Itsuki to barely win.
According to the , recently it has inexplicable continuous disappearance incident occurs, seems tentacle organism is found from the body of the victim.
Faint curiosity and sense of justice in the hearts of Itsuki heard the story, it begins to sprout complex emotions such as revenge against the mastermind of the incident.
And she, with a capacity obtained in coexistence with tentacles organisms, it was to solidify their resolve to cooperate in the investigation of the incident ....
Season Tour of, early summer to make Omoikaesa Ano abominable incident to Itsuki.
In prestigious girls' school with a good faith some school spirit to accept a student with no relatives, Itsuki the disappearance incident to give the information of that occurred.
She was infiltrated as a student, start a school of the investigation along with the same that was infiltrated as a teacher.
Itsuki is ...... Is it possible to obtain a core of disappearance cases, the truth about tentacles organisms