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.

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.

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.

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.

Miyu's Awful Cuisine

Mama Comes Over on Mother's Day

Ruu-kun, Popular at School

Ruu-kun's Acting Debut

A Date in the Park Between Cousins

Playing with Spaced-Out Santa

June, on Father's Day ... Papa Comes

The Mysterious Boy, Yaboshi Seiya

The Mysterious Planet Sharaku

Help! Transforming Wanya

Mikan Ran Away, Saionji!

Ocean and the Lovers' Tree

India's treasure is SAIONJI?

Momoka's Passport

The Mysterious Home is Miyu's Real House?

The Off-season Home Visit

Principal, Monkichi Reunite

The Hike of Fear

Everyone, Gather at Saionji's

The Blackout Halloween

Ruu-kun and the Department Store

Yaboshi Saiya's Warning

A Correspondence with Ruu's Parents

Sister Comes to Saionji

Nanami and the Mysterious Tsukemonoishi

Wanya Wanya

The First Christmas with Saionji

Chris, Ski, Mansion

Kanata's Childhood Friend

Kanata's Promised Date

Bye Bye Wanya

The Heiomachi Onsen Excursion

Miyu's Idol Debut

Ruu-kun Has Multiplied

All 100 Ruu-kuns, Gather!

Kanata's Rival Appears?

Kanata and Nozomu's Showdown

Where is Okame-chan?

The Family Assembles at Saionji

Koinobori Aren't Scary!

Cinderella Inside the Book

Chris and the White Whale

Miyu and Mini-Miyu Go to School

Santa and Kanata's Weird Pot

Mizuno-sensei's Mysterious Trip

Stop it, Lazy Wanya

Mika-san's Mysterious Promise

Saionji's Ghost stories and the Mysterious Koishi Stones

Miyu and Kanata Go to America

Everyone but Santa goes to America

The Weird Object That Seiya Left Behind

Mecha Wanya Attacks!

Nozomu and His World of Dream

Our Pet is Number One

Peppo, Ruu, and Wanya

Mikan's Work Place is the Saionji

Miyu and Kanata's First Kiss

Nagging at the Saionji Temple

Spooky Mountain Villa

Meeting a Penpal

Inventions are so Boring

A Friend, a Rival, a Competitor

Teru Arrives From Planet

Bowmeow Versus Mister

Ousted Guava Falls in Love

Momoka’s Christmas

The Seven Gods of Fortune

The Same Kimono as Miyu

Miyu and Little Boy Kanata

Goodbye Evil Gang

Valentine’s Day in Heiomachi

Ruu in the Lead Role at the Cultural Festival

On the Night of the Full Moon

See You Again