Someone's Girlfriend

Someone's Girlfriend (アイツノカノジョ) is a Japanese web manga series written and illustrated by Nikumaru. It has been serialized on Shogakukan's digital platform Sunday Webry since September 2022.

Publication
Written and illustrated by Nikumaru, Someone's Girlfriend was first published as a one-shot on Shogakukan's digital platform Sunday Webry on November 27, 2021, and started its serialization on the same platform on September 30, 2022. Shogakukan has collected its chapters into individual volumes, with the first one released on February 10, 2023. As of June 11, 2024, four volumes have been released.

The manga has been licensed for English released in North America by Seven Seas Entertainment.

Reception
The series was nominated for the 2023 Next Manga Award in the web manga category, and has been nominated for the 2024 edition in the same category in 2024.