Born in the Gunma Prefecture, Retsu is a hot blooded junior high school student who is full of courage and confidence. He always trains himself and thinks in the ultra positive side for the whole group. Thought he is full of courage, he is sometimes dimwitted to the point of confusing his teammates and the Jewelpets. He is very popular with the girls due to his burning spirit and personality, causing his little brother to get jealous. But he knows his younger brother's feelings well and admits his faults in the later episodes. On the last episodes, his link with Angela finally gave him his Jewel of Fate, the Red Angelite that allowed him to transform into his new form. By the end of the series, he and Midori had return to the Human World while using his powers against evil.