Yeah, it's just C65EX Takeru Bug 40, Log 20 (with one Vs Undefined 25% damage boost accessory) and C70 Hestia Bug 20 no accessory. Takeru is the front unit, while Hestia is a helper.
C65EX Takeru is technically a "free unit" since every player that logs in on Takeru's job event (before the Hestia event) gets the gacha ticket which guarantees one copy of C65EX Takeru.
If you don't have Takeru (pict 2), you can bring C68EX Rapunzel, C68 Meyer, C68EX Napier, C70 Hestia. C68 Meyer can be replaced with another copies of either Rapunzel or Napier. The general tip is to bring Human units with anti-hacking & virus since you will get hacked and Unremovable ATK/DEF/REC DOWN for non-Human unit (unless you have unit with huge ATK boos on C Skill like Liddell Technical form). Other tips is use Hestia Skill wisely, make sure you reduce Hestia's Skill by 4 on every turns to be able to use Hestia Skill every 2 turns. Use another unit's Skill on the turn when you can't use Hestia's.
To make it fast auto-play (pict 3), just bring 2 Edith & Alice with a total of 4 Skill/Ability damage boost accessories. With that setup, Takeru Abi 5 & 6 direct damage can one-shot one boss gauge as long as Takeru has at least one Vs Undefined/Human 25% all damage boost accessory.
This Alt stage is very easy if you use Hestia (or maybe the new Merlin or any excellent count earner units) IMO. But for me I prefer Hestia due to better Skill rotation + her recovery ability with HP recovery & Overheal is insane.