1. 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.

2. 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.

3. 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.

4. 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.

5. Miyu's Awful Cuisine

No synopsis available.

6. Mama Comes Over on Mother's Day

No synopsis available.

7. Ruu-kun, Popular at School

No synopsis available.

8. Ruu-kun's Acting Debut

No synopsis available.

9. A Date in the Park Between Cousins

No synopsis available.

10. Playing with Spaced-Out Santa

No synopsis available.

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

No synopsis available.

12. The Mysterious Boy, Yaboshi Seiya

No synopsis available.

13. The Mysterious Planet Sharaku

No synopsis available.

15. Mikan Ran Away, Saionji!

No synopsis available.

16. Ocean and the Lovers' Tree

No synopsis available.

17. India's treasure is SAIONJI?

No synopsis available.

18. Momoka's Passport

No synopsis available.

19. The Mysterious Home is Miyu's Real House?

No synopsis available.

20. The Off-season Home Visit

No synopsis available.

21. Principal, Monkichi Reunite

No synopsis available.

22. The Hike of Fear

No synopsis available.

23. Everyone, Gather at Saionji's

No synopsis available.

24. The Blackout Halloween

No synopsis available.

25. Ruu-kun and the Department Store

No synopsis available.

26. Yaboshi Saiya's Warning

No synopsis available.

27. A Correspondence with Ruu's Parents

No synopsis available.

28. Sister Comes to Saionji

No synopsis available.

29. Nanami and the Mysterious Tsukemonoishi

No synopsis available.

30. Wanya Wanya

No synopsis available.

31. The First Christmas with Saionji

No synopsis available.

32. Chris, Ski, Mansion

No synopsis available.

33. Kanata's Childhood Friend

No synopsis available.

34. Kanata's Promised Date

No synopsis available.

35. Bye Bye Wanya

No synopsis available.

36. The Heiomachi Onsen Excursion

No synopsis available.

37. Miyu's Idol Debut

No synopsis available.

38. Ruu-kun Has Multiplied

No synopsis available.

39. All 100 Ruu-kuns, Gather!

No synopsis available.

40. Kanata's Rival Appears?

No synopsis available.

41. Kanata and Nozomu's Showdown

No synopsis available.

42. Where is Okame-chan?

No synopsis available.

43. The Family Assembles at Saionji

No synopsis available.

44. Koinobori Aren't Scary!

No synopsis available.

45. Cinderella Inside the Book

No synopsis available.

46. Chris and the White Whale

No synopsis available.

47. Miyu and Mini-Miyu Go to School

No synopsis available.

48. Santa and Kanata's Weird Pot

No synopsis available.

49. Mizuno-sensei's Mysterious Trip

No synopsis available.

50. Stop it, Lazy Wanya

No synopsis available.

51. Mika-san's Mysterious Promise

No synopsis available.

52. Saionji's Ghost stories and the Mysterious Koishi Stones

No synopsis available.

53. Miyu and Kanata Go to America

No synopsis available.

54. Everyone but Santa goes to America

No synopsis available.

55. The Weird Object That Seiya Left Behind

No synopsis available.

56. Mecha Wanya Attacks!

No synopsis available.

57. Nozomu and His World of Dream

No synopsis available.

58. Our Pet is Number One

No synopsis available.

59. Peppo, Ruu, and Wanya

No synopsis available.

60. Mikan's Work Place is the Saionji

No synopsis available.

61. Miyu and Kanata's First Kiss

No synopsis available.

62. Nagging at the Saionji Temple

No synopsis available.

63. Spooky Mountain Villa

No synopsis available.

64. Meeting a Penpal

No synopsis available.

65. Inventions are so Boring

No synopsis available.

66. A Friend, a Rival, a Competitor

No synopsis available.

67. Teru Arrives From Planet

No synopsis available.

68. Bowmeow Versus Mister

No synopsis available.

69. Ousted Guava Falls in Love

No synopsis available.

70. Momoka’s Christmas

No synopsis available.

71. The Seven Gods of Fortune

No synopsis available.

72. The Same Kimono as Miyu

No synopsis available.

73. Miyu and Little Boy Kanata

No synopsis available.

74. Goodbye Evil Gang

No synopsis available.

75. Valentine’s Day in Heiomachi

No synopsis available.

76. Ruu in the Lead Role at the Cultural Festival

No synopsis available.

77. On the Night of the Full Moon

No synopsis available.

78. See You Again

No synopsis available.