*Hello, Planet. tells the story of an android (portrayed by Miku) who wakes up alone in a shelter. She discovers that the world is in an apocalyptic state. She sets herself to take care of the pot containing the last surviving plant. She waits for it to sprout, and to receive a message from the exterior of the shelter. With neither situation taking place and her master missing, she takes the plant and embarks in a journey to find him.
Throughout her journey, she greets every object and place that she meets in a clueless, innocent, and cheerful way. After beginning to deteriorate and break from the journey, she arrives to where her master is, yet she discovers that he has passed. Stricken with sadness, she begins to cry, and her tears make the plant sprout. She dies, but the plant's vines rise through the sky, time, and space, to finally arrive in heaven, where she meets with her master again.
The PV ends with showing the planet's vegetation as beginning to restore, while it displays the phrase "The Last, LOVE SONG from our planet..." Meanwhile, in the shelter from before, a mysterious letter finally arrives. After the letter's delivery, the "deceased" android is depicted resting next to her master's grave along with the plant growing from the pot.
The PV simulates a video game and is similar to "Nijiiro*Adventure", another sasakure.UK song. A melody from the classic composer Johann Sebastian Bach is present throughout the song.
This song received its own mini-game in the expansion pack for Project DIVA: "DLC 1: Miku Uta, Okawari". This is a platform video game with 4 levels, and an 8-bit style similar to the one shown in the original PV. It also features two different endings.
The final score shown in the PV, "105900", actually is wordplay. The number 1059 can be read as 10-5-9 (テン-五-九 ten-go-ku). 天国 (Tengoku) means 'heaven', which fits with the moment when Miku ascends to Heaven and meets her beloved one. There are also multiple other references, such as 003390 for Sasakure, while 022160, nijiiro, has been speculated to be related to Nijiiro*Adventure, another sasakure.UK song with a similar style of PV.