Song of Summer: Exalted (Deadly) is the fourth stage in Total War: Summer Special. It drops 1,000,000 XP when completed for the first time.
At the beginning, Squire Rels spawns infinitely at a fast rate,Bearkini spawns after ~11.5 seconds, and Pigeon de Sable spawns at a mild rate after ~23 seconds. Up to 5 Pigeon de Sables can be seen in total.
When the enemy base is damaged, Sunny Celeboodle spawns as the boss alongside Gory Groom, Kory and Dark Otter. 1 more Kory spawns after 40 seconds, and Dark Otter respawns up to 3 times after ~20 seconds each.
Strategy 1 (ft. Immortal Keiji)
Power-ups: Rich cat could help with the beginning, but not necessary.
All cats cannot be their evolved form or lower, except the other defense combo. Using Sportswomen is necessary for this strategy. All cats I used were level 30 or lower (Wrestling Cat). I'm not sure if Pizza's Wave Talent is necessary, but mine's only level 1.
Battle: Stall the first Squirrel Rei with a single Eraser. When Bearkini spawns, you could either let it attack your base, or stall with both Erasers. In the end, you want to spawn Keiji, and protect with Erasers. Ideally, Keiji doesn't get strengthened, so you can upgrade your wallet or save up money.
But regardless, once Bearkini is knocked back a second time, and is around the middle of the map, spawn all of your bottom row. Bearkini should die soon, and all your troops march towards the base. Then just keep spawning the bottom row, using the cat cannon to stop the Gory Groom from advancing to Keiji.
At around the third Keiji, everything should be dead except for the Sunny Celeboodle. You can now stop sending Eraser Cats, and only send Octopus Cat, Wresting Cat, Fishman Cat, and when you can, Immortal Keiji.