DLC2 now available from DLsite. I expect the combined package in a few days time.
Dragon Knight, Summoner and the third mysterious girl in the twitter is the Demon Sovereign. Dragon Knight wants information, the Summoner most likely wants a good place to sleep while the Demon Sovereign is a gourmet.
If the previous DLC was any indication, the Dragon Knight and Summoner will unlock after completely finishing the 3rd and 4th dungeons.
Demon Sovereign might well appear towards the end of a run.
Like the first DLC, players need to stock up on the most potent aphrodisiac and sedative ingredients.
For the final sex scene before winning the target over, benchmark is set at 80. Actually impossible even with the best combination of fittings unless the player has at least some of the other girls as allies. No difference to the other DLC girls in modus operandi except for the ludicrous final requirement.
Demon Sovereign: Attack strength 25, reduces boss attack rating by 10(!)
(Devil) Summoner: Attack strength 15, brings back 1/4 of fallen units post-battle (together with the cleric and bishop, that's 75% total casualties restored. HUGE!)
Dragon Knight: Attack strength 19, fodder attack rating reduced by 5. The wizard's special ability, but 5 times stronger. Only really useful in early dungeons for trivial casualties.
If players have seen at least one ending before, the time limit is now up from 75 days in DLC1 to 90 days with the combined package. This means it's actually impossible to see every single heroine's pregnant ending and post-pregnancy chat scene because there just aren't enough days to go around. This can still be circumvented to some extent by playing the game through at least twice and then prioritising getting the heroine with missing scenes before the time limit is up.