Sōichirō Shidō (紫堂 総一郎 Shidō Sōichirō), better known by his stage name Nachi (那智), is a character who appeared only in the manga.
Soichiro changed his name to Nachi after getting plastic surgery because he was tired of being called "Cheesy" by Madoka. He was knifed shortly after the incident when Ms. Oshige opened one of Mitsuki's birthday presents. In the seventh volume, Nachi and Madoka can be seen on a balcony watching Mitsuki's performance. He is also a servant of a prince.
- Whenever he appeared, almost all the fan letters and emails to the Ribon website went to were for Nachi.
- Pure Love, Songs of Love (First appearance)
- Absolute Territory—Midnight Revolution
- Not Even God Can Stop the Moon
- If My Wishes Will Never Come True, I Will...
- To My One and Only Eichi