The Eternal Pledge is the fourth episode of Tenchi in Tokyo.
It originally aired on April 22, 1997 in Japan, and on August 30, 2000 in North America.
When Tenchi is asked by Sakuya to go sight seeing with her so she can give him a tour of Tokyo, they encountered a giant mansion and the caretaker who told them the legend of the House of the Eternal Pledge, not knowing he's one of Yugi's Henchman. Meanwhile Ryoko and Ayeka tried to find a way to enter Tenchi's room when the Blanket is folded, leaving only a small entrance through the tunnel.
- Tenchi Masaki = Masami Kikuchi (Japaneses) Matt K. Miller (English)
- Ryoko Hakubi = Ai Orikasa (Japaneses) Petrea Burchard (English)
- Ayeka Masaki Jurai = Haruhi Nanao (Japaneses) Jennifer Darling (English)
- Sasami Masaki Jurai = Chisa Yokoyama (Japaneses) Sherry Lynn (English)
- Washu Hakubi = Yuko Kobayashi (Japaneses) Kate T. Vogt (English)
- Yugi = Akiko Yajima (Japaneses) Debi Derryberry (English)
- First Appearance of Yugi's Henchman