Di Gi Charat is a series of shorts created as advertisements for "Digital Gamers", a store in Akihabara. The series follows Dejiko, princess of Di Gi Charat planet, and her companions, Puchiko and Gema, as well as Dejiko's rival, Rabi~en~Rose through daily ordeals they encounter while working at Gamers.
Princess Di Gi Charat came from the planet Di Gi Charat given only a cat cap and an outfit to disguise herself. Unfortunately she came with no money, only her guardian Gema and friend Petite Charat. Luckily the three stumbled upon a manager of the store Gamers, who offered them a home if they worked at the store. However Di Gi Charat is a selfish young girl who wishes of becoming a star.

[Source: Anime News Network]

The Di Gi Charat Summer Special was a four episode series that aired over two days, August 22, 2000 to August 23, 2000. This was the first series that Piyoko appeared in and the plot involves her attempting to hold Dejiko hostage for ransom.

• Summer Special 2000 Episode 1 - Here comes Pyoko-nyo!
• Summer Special 2000 Episode 2 - It's the Black Gamers-nyo
• Summer Special 2000 Episode 3 - The Return of Abarenbou
• Summer Special 2000 Episode 4 - Summer Bug

[Source: AniDB & Wikipedia]

The Christmas Special aired in December 2000 and featured Piyoko again attempting to capture Dejiko by inviting all the characters on a cruise.

[Source: Wikipedia]

The Ohamami Special consisted of four independent episodes of Di Gi Charat with no continuation that aired in Spring 2001 in Japan.

• Ohanami Special Episode 1 - The Evil Settles Down

• Ohanami Special Episode 2 - Sakura Sakura
• Ohanami Special Episode 3 - Long Haired Onii-san-nyu
• Ohanami Special Episode 4 - Don't Call me Rabi-en-Rose

[Source: AniDB & Wikipedia]

Di Gi Charat (call her Dejiko for short) and Petit Charat (the cute little charat) come down to Earth, where they want to be idols, or something like that. Rabi~en~Rose (a random girl with bunny ears) decides they're in her way of becoming an idol herself. They all end up working at Gamers, where various otaku, children, and humanoid fingers walk in and act like morons.

Contains:
Gema no Sumika
Tsusode shiu Engekidan (ii ne!)

[Source: AniDB]

The Di Gi Charat Natsuyasumi Special was another four episode series set in America that aired almost a year after the original series from August 2, 2001 to August 3, 2001. The young American otaku, Rodoyan, is introduced in this series.

• Natsuyasumi Special Episode 1 - Dejiko in America 1
• Natsuyasumi Special Episode 2 - Dejiko in America 2
When Puchiko wanted to get off a bus she couldn't reach the signal button, and the driver (looks just like Abarenbou) kept accelerating until reaching America. Soon Dejiko received a letter from Rod Young, an American boy and a big fan of Dejiko who let Puchiko stay with him, inviting Dejiko to America to visit them and pick Puchiko up.

• Natsuyasumi Special Episode 3 - Depurapyogebo Debut
A contest of bands was about to be held at Akihabara; the first prize is 10-year supply of nattou, Dejiko's favorite food. She decided to enroll but couldn't find enough members or instruments.

• Natsuyasumi Special Episode 4 - Isn't Anyone Here-nyo?

Dejiko and gangs of Gamers went to the mountains, but when night fell people began to disappear one by one

[Source: Anime News Network, AniDB & Wikipedia]

Dejiko decided to take a vacation and visit her home, Planet Di Gi Charat, together with Puchiko, Gema, and (accidentally) Rabi~en~Rose. However, Piyoko and her aids would not let go this chance to capture her.

[Source: Anime News Network]

Piyoko and her villainous friends plot for a way to use the mouth rocket to beat Dejiko's laser eyes.

Deijiko is the princess of the planet of Di Gi Charat. After reading a book, she is influenced to want to help everyone be happy. She leaves the castle and pretends to be a normal girl. She tries to make everyone happy by taking various jobs around the town and thereby making all sorts of new friends and inevitably, enemies.

[Source: Anime News Network]

Di Gi Charat (a.k.a. Dejiko) - along with Petit Charat (a.k.a. Puchiko) and Gema - travels to Earth as part of her training to become a full-fledged princess. They crash on a small town in Japan, where they meet the Omocha brothers (who spend most of their time thinking how cute Puchiko is) and Mr. & Mrs. Ankoro (an elderly couple that makes Japanese sweets).

[Source: Anime News Network]

This is sweet and bitter love story of Dejiko who is a grown up. The story begins on the Christmas day. Dejiko or Di Gi Carat is working part-time at a bakery shop. On her way from the shop, she happens to meet a young guy, Senba Taokuo at a park. Then, she meets him again in a town. While Dejiko begins to care for Tako and she’s looking forward meet him again, Takuo drops in at her shop.... Whether will she succeed in love?

[Source: AnimeNfo]