"MarImo" is one of Giga-P's first original VOCALOID works. He claims it was an experiment. The song features a genderbend of Megurine Luka, Megurine Ruki (Luki), whose voice parameters are set at GEN=100, PIT=-4097, PBS=24.
In the song, the singer praises marimo (Aegagropila linnaei), a rare form of algae that grows in green, velvety balls. The singer even claims that marimo gives him an erection, which is unsurprising, considering that Giga-P is known for including sexual themes in his songs.
The Super Full version of "MarImo" was released on July 24, 2013 on Giga-P and Orebanana's album Gigabanana the Best ~USUSHIO Aji~. This version of the song is longer and Luka's vocals are different; although still down-pitched, they sound less dry and more nasal. A cover by Soraru is featured on Gigabanana the Best ~USUSHIO Aji~'s utaite counterpart album, Gigabanana The Best ~NORISHIO Aji~.