Season
- Season 1 2001-10-02
Episode
- Episode 1: Okojo-san has arrived!/Okojo-san goes to the hospital
- Episode 2: Okojo-san's Shiawase-sou adventure/Laughing Saeki
- Episode 3: Okojo's grave/The enemy is a cleaning machine
- Episode 4: Kojopii goes to paradise/Kojopii's campus life
- Episode 5: Kojopii's secret/Kojopii vs Tacchin
- Episode 6: Tachhin's tears/Kojopii's nightmare
- Episode 7: Kojopii's makeover!/Kojopii in love
- Episode 8: The fantastic hiking/Cosmos-hata's Tsukahara
- Episode 9: Life with Kojopii/There is paradise in Kotatsu
- Episode 10: Yuki, Yuuta and Karaage/Leader Okojo! Appearance Chapter
- Episode 11: Choruri and Nezumi-dono/I like Kojopii
- Episode 12: Battle! Christmas tree/Kojopii's Merry Christmas
- Episode 13: Test for Leader Okojo!/Tsuchiya returns home
- Episode 14: Chichi's memories/Kojopii, TV debut
- Episode 15: Kojopii has been takened away
- Episode 16: The mystery of the missing drawing/Choruri's happiness
- Episode 17: Choruri VS Watabokori/Leader Kojopii! Battle Chapter
- Episode 18: Hari-nezumi is high-class?/Mayumi's love letter battle
- Episode 19: Mayumi's love letter battle/Save Itachi household!
- Episode 20: Tsukahara, day of dreams/Leader Kojopii! Duty Chapter
- Episode 21: Mystery of Ferret/Kojopii becomes a father
- Episode 22: Let's grow it! Seed of dreams/Kojopii flies in the sky
- Episode 23: Kojopii is trapped/Motemote's condition
- Episode 24: Kojopii becomes wild
- Episode 25: Leader Kojopii! Counterattack Chapter/Under the cherry blossoms
- Episode 26: Okojo VS Okojo/Thy name is Kojuru
- Episode 27: Kojuru goes to Shiawase-sou/Leader Okojo! New school term Chapter
- Episode 28: Tsubame is being targeted!/Kojuru's favourite thing?
- Episode 29: Ojuko and Granny/Leader Okojo! Hospitalised Chapter
- Episode 30: Death match! Carp's streamer/I want to meet my idol!
- Episode 31: Kagaku-kun's terrifying experiment/Leader Okojo! Teaching Chapter
- Episode 32: Being a mangaka is tiring/Hide-and-seek competition
- Episode 33: Miyu is a great trimmer?/Leader Okojo! Prosperity Chapter
- Episode 34: The lost wild nature/Yearning of humans
- Episode 35: I cannot say "Thank you"/Leader Okojo! Home visit Chapter
- Episode 36: Kagaku-kun's second challenge/Okojo VS Mecha-Okojo
- Episode 37: Kojuru and Choruri/Leader Okojo! Purchasing department Chapter
- Episode 38: Mayumi's date battle/Tsukahara's Okojo cut
- Episode 39: A wish upon a star/Leader Okojo! Pool Chapter
- Episode 40: Kojopii's return of kindness/Mayumi's pair-look battle
- Episode 41: Leader Okojo! Seaside School Chapter/Part-time Panic
- Episode 42: Poolside crisis!/Tsuchiya dances in delusion
- Episode 43: Colorful Kojopii/Leader Okojo! Guide to life Chapter
- Episode 44: Tacchin, a start in love/Kojoru, why are you white?
- Episode 45: I am Kojopii?/Hasegawa, afternoon times
- Episode 46: Tacchin's love and hatred/Heart-throbbing panic
- Episode 47: Yearning for Okojo/Leader Okojo! Summer holiday Chapter
- Episode 48: Choruri's marriage/Mecha-Okojo's counterattack
- Episode 49: I like you! Tsuchiya/Leader Okojo! Sports meet Chapter
- Episode 50: Warm Kojoru/Leader Okojo! Finale Chapter
- Episode 51: Shiawase-sou's Okojo-san
Shiawase Apartment's Okojo-san Season 1 Mayumi's date battle/Tsukahara's Okojo cut
A white ermine Okojo-san lives at an exotic pet store run by a greedy manager, until he escapes one day. In the chaos following, he ends up unconscious in a garbage can, where college student Haruka Tsuchiya finds him. Mistaking him for a ferret, Tsuchiya takes Okojo home with him. At the Shiawase apartment complex, Okojo meets other pets, including the mouse Chorori, and the various eccentric human tenants. With his friends, Okojo struggles to adapt to life with humans, vacuum cleaners, and all the other things that come with human society.
