
Tsukiko's relationship with Dai deteriorated when she realized Dai was very childish and just overall feckless. Instead, Tsukiko entered a relationship with another man, Dai Tennan, and she became pregnant and gave birth to a son named Kai. If not for his embarrassment about Miki being based off of her, he might have tried harder to be there to console Tsukiko's loss. Soon after he started raising her, Ken was killed in a mysterious space incident. Worried about being discovered by Tsukiko, he erased the A.I.'s memory, put the her into an artificial body, age-regressed her to a baby, named her Miki Steinbeck (who grew to resemble Mitsuki Sanada from Dual!, in looks and personality, being an indirect reincarnation of her) and raised her as his daughter, never telling her that she was an A.I. He was a bit ashamed of himself for making a copy of Tsukiko, but as it had an Astral, which are given human rights, it would be murder to delete the program. Through skill and a trick of fate, he unintentionally created an A.I. After Ken and Tsukiko married, they introduced Hiroshi to their new born baby, Kiriko, He wished for their happiness and settled his own feelings by pouring his attention into creating an A.I. These two seem to be mixed up reincarnations of Hiroshi Rara and Ken Sanada from Dual! Parallel Trouble Adventure (Manada resembles Sanada exactly). She was also the subject of affection of a fellow researcher, Dr.

While Tsukiko was still with the Galaxy Academy, studying artificial intelligence, she met and came to be in a relationship with her future husband, Ken Raraiba Steinbeck.


She seems to be among the youngest generation, when seated for the pre-party before Rea's wedding, she was seated according to order of "joining the assembly," at the farthest end.

Tsukiko was born and raised in Masaki Village, among the other descendants of Yosho and his first wife, Kasumi.
