Hanakomachi Momoka

UFO Baby (だぁ!だぁ!だぁ!, Dā! Dā! Dā!?) is a shōjo comedy manga by Mika Kawamura, serialized by Kodansha in Nakayoshi between February 1998 and March 2002, and collected in nine bound volumes. The series was adapted as a 78-episode anime television series, produced by NHK and animated by J.C.Staff, broadcast between March 2000 and February 2002 on NHK's BS2 broadcast satellite network. The series was one of the top-rated anime series during its initial broadcast.

UFO Baby is about two junior high school students, Miyu and Kanata, who find and must take care of an abandoned alien baby without anyone discovering they are living together. The anime concluded before the manga did, resulting in different endings for each series. Kawamura later wrote a sequel to the manga, Shin Daa! Daa! Daa!.

Miyu Kouzuki is an 8th-grade student whose parents leave for the United States to work for NASA and arrange for her to stay with their long-time family friend, Hōsho Saionji, a monk who lives at an old temple atop a hill. However, the monk himself leaves soon after for India on a year-long voyage, leaving Miyu in having to stay together in the same house with his son, Kanata.

Suddenly, the landing of a UFO which transports an alien baby, Ruu, along with his cat-like "sitterpet", Wannyā, who arrive after they were separated from their own planet, Otto, due to falling into an interplanetary worm hole, a time warp which can transport objects across several regions, planets and timeplanes. They cannot return to their home planet due to it being too difficult to reach, and Wannyā therefore requests Kanata and Miyu that they allow them to stay in their house. They agree. Miyu and Kanata learn from Wannyā that people from Planet Otto look identical to human beings, and that he himself can transform into human beings, animals and objects.

Miyu and Kanata feel a very deep love for Baby Ruu, who also cares for them deeply and likens them to his parents due to their similar looks, and often go to great lengths to help and protect him and Wannyā. As the story progresses, the group are often involved in comedic and funny situations but grow to greatly love each other. The story ends with a rescue team from outer space coming to Earth and returning Ruu and Wannyā to Otto safely and Miyu going to a boarding school alone. Though years later Miyu and Kanata reunite, get married and have a daughter named Miu. They also reunite with Wannya and Ruu.

Source: Wikipedia