This isn't a particularly tough fight, but it doesn't play to Akiyama's strengths. Arai gets very stable when he's in HEAT mode, and since Akiyama gets so much mileage out of knockdowns, your single best use of HEAT meter is comboing Arai against the nearby wall. After another lengthy cutscene, you'll wind up on the roof of Millennium Tower, fighting four tough boss fights as each of the main characters.

When you're ready to finish the main game, talk to Date. This increases your HEAT meter and unlocks new abilities. It's a good idea to go to the Theater Underground as each character at this point, invest in the Professor's machine, and beat each of the recorded boss encounters. Make sure each character is wearing protective gear, has a full supply of healing items, and is around level 13 if not higher. You can freely switch between them to pursue their substories, grind XP, explore the city, and generally prepare for the final showdown. At this point, all four protagonists are hanging out in New Serena.

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