is a Japanese fashion producer and tarento, represented by . She is a former member of the Japanese idol girl group AKB48 and the founder of the fashion label Haluhiroine, which is distributed through Earth Music & Ecology.
Kojima passed AKB48's 14th generation auditions in 2012. On July 20, Kojima was announced to be in a new sub-unit, Tentoumu Chu!, consisting of trainee members from AKB48 and its sister groups, together with Nana Okada, Miki Nishino, Ryoha Kitagawa, Nagisa Shibuya, Meru Tashima and Mio Tomonaga. The sub-unit debuted on July 31. Kojima, Okada, and Nishino, also known as the , were promoted to AKB48's Team 4 on August 24. She was selected to perform in a single title song for the first time for the song "Mae Shika Mukanee" (2014). She was shuffled to Team K during AKB48's Daisosaku Matsuri.
On April 6, 2017, Kojima transferred talent agencies from AKS, which managed AKB48 and most of its members, to Sun Music Production. She participated in the reality show Produce 48 in 2018, but was eliminated in episode 8, finishing in 34th place.
On January 12, 2019, Kojima announced her graduation from AKB48 during a Team K concert at Tokyo Dome City Hall. On April 27, her graduation ceremony was held during the AKB48 Group Spring LIVE Festival in Yokohama Stadium. On May 12, her final performance was held at the AKB48 Theater. Her YouTube channel, the , was launched shortly after. She also announced the launch of her own clothing brand, , which name is a combination of the Finnish word for "desire" (halu) and the English word "heroine".
On January 6, 2024, Kojima announced her marriage to actor Yuya Kido.