, is a freshly graduated 23-year-old elementary school instructor who has been placed in charge of the third grade class 3-1. Many of the idealistic notions he holds about his job, however, are quickly put to the test as he finds himself dealing with unexpected, complex situations, not the least of which is having a shamelessly flirtatious nine-year-old doing everything in her power to win his affections. Aoki's complete lack of previous teaching experience sometimes makes it hard for him to control his class or maintain their interest, a situation further complicated by the ease with which he is flustered by Rin's sexual innuendo and Kuro's barbed remarks about his status as a virgin. His relatively normal, uneventful childhood also complicates his efforts to quickly and easily grasp the hardships faced by some of his students, though this has in no way discouraged him from trying or diminished his desire to help them. In fact, his seemingly unshakable enthusiasm, hands-on attitude, and emotional attachment to his students has often caused him to butt heads with the more traditional Sae Shirai. Almost from the beginning, Aoki has shared a special bond with Rin, one which has deepened and become so complex over time that even he, at one point, was uncertain of what exactly his feelings towards her were. Regardless of the nature of his love for Rin, his protectiveness of her has led him to become increasingly suspicious and mistrustful of the motives of her guardian and cousin, Reiji Kokonoe.