"Battle (Shin Megami Tensei) - SiIvaGunner: King for Another Day" is a high quality rip of "Battle (Shin Megami Tensei)" from SiIvaGunner: King for Another Day. It represents the King for Another Day Tournament contender Jack Bros.
This is a cover of "Battle" from the original Shin Megami Tensei. The cover's opening is modeled on "Life Will Change" from Persona 5. At 0:45 "Blooming Villain" from Persona 5 is quoted, and at 1:54 "Battle - A2 (Tokyo Battle)" from Shin Megami Tensei IV is quoted.