New caregiver Itsuki Maino's first assignment is elderly Mr. Saito, who has limited mobility and difficulty speaking. Itsuki carefully performs her nursing duties, always mindful of his condition and adapting her care accordingly. However, Mr. Saito becomes increasingly captivated by Itsuki's big tits, and his feelings gradually shift in unexpected directions. Unaware of his gaze, Itsuki begins to subconsciously respond to the stimulation, and deep within her, a shockingly twisted sexual desire starts to awaken. Contrary to her original purpose as a caregiver, she slowly begins to find a different kind of meaning in her relationship with the old man.