Suddenly 4 People in the Family?!
E1
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.
Ruu-kun is Climbing the Chimney
E2
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.
Chris Drops By
E3
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.
Momoka and the Necklace
E4
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.
Miyu's Awful Cuisine
E5
Mama Comes Over on Mother's Day
E6
Ruu-kun, Popular at School
E7
Ruu-kun's Acting Debut
E8
A Date in the Park Between Cousins
E9
Playing with Spaced-Out Santa
E10
June, on Father's Day ... Papa Comes
E11
The Mysterious Boy, Yaboshi Seiya
E12
The Mysterious Planet Sharaku
E13
Help! Transforming Wanya
E14
Mikan Ran Away, Saionji!
E15
Ocean and the Lovers' Tree
E16
India's treasure is SAIONJI?
E17
Momoka's Passport
E18
The Mysterious Home is Miyu's Real House?
E19
The Off-season Home Visit
E20
Principal, Monkichi Reunite
E21
The Hike of Fear
E22
Everyone, Gather at Saionji's
E23
The Blackout Halloween
E24
Ruu-kun and the Department Store
E25
Yaboshi Saiya's Warning
E26
A Correspondence with Ruu's Parents
E27
Sister Comes to Saionji
E28
Nanami and the Mysterious Tsukemonoishi
E29
Wanya Wanya
E30
The First Christmas with Saionji
E31
Chris, Ski, Mansion
E32
Kanata's Childhood Friend
E33
Kanata's Promised Date
E34
Bye Bye Wanya
E35
The Heiomachi Onsen Excursion
E36
Miyu's Idol Debut
E37
Ruu-kun Has Multiplied
E38
All 100 Ruu-kuns, Gather!
E39
Kanata's Rival Appears?
E40
Kanata and Nozomu's Showdown
E41
Where is Okame-chan?
E42
The Family Assembles at Saionji
E43
Koinobori Aren't Scary!
E44
Cinderella Inside the Book
E45
Chris and the White Whale
E46
Miyu and Mini-Miyu Go to School
E47
Santa and Kanata's Weird Pot
E48
Mizuno-sensei's Mysterious Trip
E49
Stop it, Lazy Wanya
E50
Mika-san's Mysterious Promise
E51
Saionji's Ghost stories and the Mysterious Koishi Stones
E52
Miyu and Kanata Go to America
E53
Everyone but Santa goes to America
E54
The Weird Object That Seiya Left Behind
E55
Mecha Wanya Attacks!
E56
Nozomu and His World of Dream
E57
Our Pet is Number One
E58
Peppo, Ruu, and Wanya
E59
Mikan's Work Place is the Saionji
E60
Miyu and Kanata's First Kiss
E61
Nagging at the Saionji Temple
E62
Spooky Mountain Villa
E63
Meeting a Penpal
E64
Inventions are so Boring
E65
A Friend, a Rival, a Competitor
E66
Teru Arrives From Planet
E67
Bowmeow Versus Mister
E68
Ousted Guava Falls in Love
E69
Momoka’s Christmas
E70
The Seven Gods of Fortune
E71
The Same Kimono as Miyu
E72
Miyu and Little Boy Kanata
E73
Goodbye Evil Gang
E74
Valentine’s Day in Heiomachi
E75
Ruu in the Lead Role at the Cultural Festival
E76
On the Night of the Full Moon
E77
See You Again
E78