She gave the names of her relatives to the characters she created for Sailor Moon, and mentions this in interviews and in several comic strips she produced, in place of author notes.

Takeuchi attended Kofu Ichi High School, where she wore a sailor uniform and joined the astronomy and manga clubs.

[4][5] These experiences influenced her work for Sailor Moon, in addition to her other pieces, such as Love Call and Rain Kiss.

Takeuchi's father encouraged her to pursue other career paths, in case she wouldn't find success as a professional artist, which is why she attended university to study chemistry.

Takeuchi graduated from the Kyoritsu College of Pharmacy, where she received a degree in chemistry and became a licensed pharmacist.

This work, Takeuchi's first serial comic, was loosely based on Jean Webster's 1912 novel Daddy-Long-Legs and on her friend Marie Koizumi, who helped write it.

After completing Maria, Takeuchi worked on the ice-skating series The Cherry Project, which was serialized in Nakayoshi from late 1990 to 1991.

While working on The Cherry Project, Takeuchi wanted to do a manga on outer space and girl fighters.

This gained a fair amount of popularity, but was canceled due to Kodansha losing seven pages of her manuscript.

Following the loss of seven pages of Takeuchi's PQ Angels manuscript, Osano departed Kodansha and the plans for the Materials Collection were canceled.

[9] On August 13, 1998, Takeuchi made her first appearance in the United States at San Diego Comic-Con for three days.

He helped somewhat with Toki☆Meka at this point in developing the idea by drawing some concept sketches, which Takeuchi showed in Toki☆Meca volume 1.

It streamed on Niconico bi-weekly, and ended in July 2015, spanning a total of 26 episodes, which cover the Dark Kingdom and Black Moon arc of the manga.

[20] In 2020, the two volumes of official "All Colored Eternal Edition" (オールカラー完全版, Ōrukarā Kanzenban) of the Sailor Moon manga was released on June 29, with Takeuchi providing new illustrations for both covers.

The two-part film covered the Stars arc of the manga (known as Shadow Galactica in Japan), and acted as a "fifth and final season" for the Sailor Moon Crystal series.

[24] Takeuchi wrote the lyrics for a number of songs featured in the Sailor Moon anime and live-action series.