Jin Misawa operates as a veteran MAILeS pilot within the anti-occupation guerrilla force Hinukan. He engages Oceanian and North American Confederation (NAC) occupying forces, providing critical combat support. His assigned unit is the prototype XMM-01 Protogouyo MAILeS, notable for its blade-type antenna and an advanced attachment system enabling rapid weapon swaps during missions. This mech builds upon the KM-01 Byakuichi frame technology, customized with Jin Misawa's personal arsenal.

His dedicated armament includes an assault rifle with underbarrel grenade launcher, a precision burst-fire handgun, a thigh-stored machete, and dagger knives concealed behind knee armor plates. The Protogouyo's onboard AI bears the designation Lambda.

During operations with Hinukan, Jin Misawa encounters younger pilot Chinen Ibuki, who struggles with survivor's guilt after losing comrades in combat. Jin Misawa intervenes directly against NAC assaults on guerrilla positions. His combat experience and presence become vital for Chinen Ibuki, aiding the younger pilot in confronting his trauma and developing resilience.

Jin Misawa sustains critical injuries in a final confrontation against NAC commander Grady Ellison. Though the guerrilla mission succeeds, he succumbs to these wounds. His death occurs while ensuring Chinen Ibuki's survival, after which Chinen continues participating in anti-occupation operations. Available materials provide no additional details regarding Jin Misawa's background, affiliations prior to Hinukan, or personal history outside this conflict period.