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Description
Mika Koizumi (小泉ミカ Koizumi Mika) was the original Yellow4 (初代イエローフォー Iero Fo Shodai) of the Biomen. She was a photographer who dreamed of following in her brother's footsteps to photograph the wildlife in Africa.

Initially, she was hesitant to join the Bioman team. However, she was convinced when she realized that if she did not fight, then even the animals in Africa that she loved would eventually be in danger. For someone who was hesitant to do battle, Mika proved a powerful and skilled martial artist.

Ultimately, Mika heroically took it upon herself to give her life to save her teammates, and sustained several repetitive blasts of Anti-Bio Particles from the Bio Killer Gun wielded by Mason. Following the complete depletion of her Bio Particles, Mika was then hit with powerful attacks from Psygorn, resulting in her death. The team later gave her a proper funeral while still in her Yellow4 form.

Mika is avenged when the Biomen destroy Psygorn, and Silva destroys Mason.

She is avenged again when the Biomen finally defeated Doctor Man.

Description
Mika Koizumi (小泉ミカ Koizumi Mika) was the original Yellow4 (初代イエローフォー Iero Fo Shodai) of the Biomen. She was a photographer who dreamed of following in her brother's footsteps to photograph the wildlife in Africa.

Initially, she was hesitant to join the Bioman team. However, she was convinced when she realized that if she did not fight, then even the animals in Africa that she loved would eventually be in danger. For someone who was hesitant to do battle, Mika proved a powerful and skilled martial artist.

Ultimately, Mika heroically took it upon herself to give her life to save her teammates, and sustained several repetitive blasts of Anti-Bio Particles from the Bio Killer Gun wielded by Mason. Following the complete depletion of her Bio Particles, Mika was then hit with powerful attacks from Psygorn, resulting in her death. The team later gave her a proper funeral while still in her Yellow4 form.

Mika is avenged when the Biomen destroy Psygorn, and Silva destroys Mason.

She is avenged again when the Biomen finally defeated Doctor Man.