S1E1 - Suddenly 4 People in the Family?!
Miyu Kōzuki's parents had moved to the United States to work for NASA. Miyu has been told she is to live with her parents' old friend. She arrives, and it turns out to be a Buddhist temple. She meets her parents' friend, the temple monk, Hoshou Saionji, and his teenaged son, Kanata. The monk soon leaves for India for religious training, leaving Miyu behind with Kanata. Shortly after, a UFO flies into the house, and inside were an alien baby called Ruu and a "sitter-pet" called Wanya. They all then decide to live in the temple together. Kanata peeps at Miyu while she's showering, just as Miyu has seen him changing.
March 28, 2000, midnight
S1E2 - Ruu-kun is Climbing the Chimney
It was Miyu's first day at her new school. She finds out that Kanata has a fan club, and he is the class president. Miyu meets Christine Hanakomachi, a half-French girl who fancies Kanata. During class, Miyu spots Ruu flying outside. Kanata and Miyu chase after Ruu. Ruu ends up climbing a chimney, forcing Kanata and Miyu to climb it too.
April 4, 2000, midnight
S1E3 - Chris Drops By
Chris and her friends came by Kanata's house to have a welcome party for Miyu. But their home turned out to be a disaster. They needed to take down floating items and hide Ruu and Wanya from their guests. Chris misunderstands Miyu and Kanata's relationship, after they discover Ruu.
April 11, 2000, midnight
S1E4 - Momoka and the Necklace
Kanata and Miyu both go out with their friends. Before Miyu leaves, she notices that her necklace is missing. A crow has taken it. But 3 year-old Momoka chases the crow away and retrieves the necklace. While shopping for dinner, Wanya loses Ruu. Ruu finds Momoka with the necklace. They both are together, when finally Kanata and Miyu find Momoka and Ruu. Momoka starts referring to Ruu as her boyfriend.
April 18, 2000, midnight
S1E5 - Miyu's Awful Cuisine
April 25, 2000, midnight
S1E6 - Mama Comes Over on Mother's Day
May 16, 2000, midnight
S1E7 - Ruu-kun, Popular at School
May 23, 2000, midnight
S1E8 - Ruu-kun's Acting Debut
May 30, 2000, midnight
S1E9 - A Date in the Park Between Cousins
June 6, 2000, midnight
S1E10 - Playing with Spaced-Out Santa
June 13, 2000, midnight
S1E11 - June, on Father's Day ... Papa Comes
June 20, 2000, midnight
S1E12 - The Mysterious Boy, Yaboshi Seiya
June 27, 2000, midnight
S1E13 - The Mysterious Planet Sharaku
July 11, 2000, midnight
S1E14 - Help! Transforming Wanya
July 18, 2000, midnight
S1E15 - Mikan Ran Away, Saionji!
July 25, 2000, midnight
S1E16 - Ocean and the Lovers' Tree
Sept. 5, 2000, midnight
S1E17 - India's treasure is SAIONJI?
Sept. 12, 2000, midnight
S1E18 - Momoka's Passport
Sept. 19, 2000, midnight
S1E19 - The Mysterious Home is Miyu's Real House?
Sept. 26, 2000, midnight
S1E20 - The Off-season Home Visit
Oct. 3, 2000, midnight
S1E21 - Principal, Monkichi Reunite
Oct. 10, 2000, midnight
S1E22 - The Hike of Fear
Oct. 17, 2000, midnight
S1E23 - Everyone, Gather at Saionji's
Oct. 24, 2000, midnight
S1E24 - The Blackout Halloween
Oct. 31, 2000, midnight
S1E25 - Ruu-kun and the Department Store
Nov. 7, 2000, midnight
S1E26 - Yaboshi Saiya's Warning
Nov. 14, 2000, midnight
S1E27 - A Correspondence with Ruu's Parents
Nov. 21, 2000, midnight
S1E28 - Sister Comes to Saionji
Nov. 28, 2000, midnight
S1E29 - Nanami and the Mysterious Tsukemonoishi
Dec. 12, 2000, midnight
S1E30 - Wanya Wanya
Dec. 19, 2000, midnight
S1E31 - The First Christmas with Saionji
Jan. 9, 2001, midnight
S1E32 - Chris, Ski, Mansion
Jan. 16, 2001, midnight
S1E33 - Kanata's Childhood Friend
Jan. 23, 2001, midnight
S1E34 - Kanata's Promised Date
Jan. 30, 2001, midnight
S1E35 - Bye Bye Wanya
Feb. 6, 2001, midnight
S1E36 - The Heiomachi Onsen Excursion
Feb. 13, 2001, midnight
S1E37 - Miyu's Idol Debut
Feb. 20, 2001, midnight
S1E38 - Ruu-kun Has Multiplied
Feb. 27, 2001, midnight
S1E39 - All 100 Ruu-kuns, Gather!
March 6, 2001, midnight
S1E40 - Kanata's Rival Appears?
April 10, 2001, midnight
S1E41 - Kanata and Nozomu's Showdown
April 17, 2001, midnight
S1E42 - Where is Okame-chan?
April 24, 2001, midnight
S1E43 - The Family Assembles at Saionji
May 1, 2001, midnight
S1E44 - Koinobori Aren't Scary!
May 8, 2001, midnight
S1E45 - Cinderella Inside the Book
May 22, 2001, midnight
S1E46 - Chris and the White Whale
May 29, 2001, midnight
S1E47 - Miyu and Mini-Miyu Go to School
June 5, 2001, midnight
S1E48 - Santa and Kanata's Weird Pot
June 12, 2001, midnight
S1E49 - Mizuno-sensei's Mysterious Trip
June 19, 2001, midnight
S1E50 - Stop it, Lazy Wanya
June 26, 2001, midnight
S1E51 - Mika-san's Mysterious Promise
July 3, 2001, midnight
S1E52 - Saionji's Ghost stories and the Mysterious Koishi Stones
July 17, 2001, midnight
S1E53 - Miyu and Kanata Go to America
July 24, 2001, midnight
S1E54 - Everyone but Santa goes to America
July 31, 2001, midnight
S1E55 - The Weird Object That Seiya Left Behind
Sept. 4, 2001, midnight
S1E56 - Mecha Wanya Attacks!
Sept. 11, 2001, midnight
S1E57 - Nozomu and His World of Dream
Sept. 18, 2001, midnight
S1E58 - Our Pet is Number One
Sept. 25, 2001, midnight
S1E59 - Peppo, Ruu, and Wanya
Oct. 2, 2001, midnight
S1E60 - Mikan's Work Place is the Saionji
Oct. 9, 2001, midnight
S1E61 - Miyu and Kanata's First Kiss
Oct. 16, 2001, midnight
S1E62 - Nagging at the Saionji Temple
Oct. 23, 2001, midnight
S1E63 - Spooky Mountain Villa
Oct. 30, 2001, midnight
S1E64 - Meeting a Penpal
Nov. 6, 2001, midnight
S1E65 - Inventions are so Boring
Nov. 13, 2001, midnight
S1E66 - A Friend, a Rival, a Competitor
Nov. 27, 2001, midnight
S1E67 - Teru Arrives From Planet
Dec. 4, 2001, midnight
S1E68 - Bowmeow Versus Mister
Dec. 11, 2001, midnight
S1E69 - Ousted Guava Falls in Love
Dec. 18, 2001, midnight
S1E70 - Momoka’s Christmas
Dec. 25, 2001, midnight
S1E71 - The Seven Gods of Fortune
Jan. 8, 2002, midnight
S1E72 - The Same Kimono as Miyu
Jan. 15, 2002, midnight
S1E73 - Miyu and Little Boy Kanata
Jan. 22, 2002, midnight
S1E74 - Goodbye Evil Gang
Jan. 29, 2002, midnight
S1E75 - Valentine’s Day in Heiomachi
Feb. 5, 2002, midnight
S1E76 - Ruu in the Lead Role at the Cultural Festival
Feb. 12, 2002, midnight
S1E77 - On the Night of the Full Moon
Feb. 19, 2002, midnight
S1E78 - See You Again
Feb. 26, 2002, midnight