Extra System Voices

Default system voice is done by Mizuhashi Kaori (Len). To unlock extra system voices done by other voice actors (selectable in the Special menu), repeatedly clear the Survival mode (meaning win 22 matches and go through the entire roster of playable characters) with Hisui & Kohaku.
Unlockable              How to Unlock
1. Yuzuki Ryouka (Arcueid)	Clear Survival mode the first time.
2. Sakuma Kumi (Ciel)   Clear Survival mode the second time.
3. Hitomi (Akiha)       Clear Survival mode the third time.
4. Matsuki Miyu (Hisui) Clear Survival mode the fourth time.
5. Takano Naoko (Kohaku)Clear Survival mode the fifth time.
6. Mouzuki Miwa (Miyako)Clear Survival mode the sixth time.
7. Natsuki Rio (Sion)   Clear Survival mode the seventh time.
8. Minami Oumi (Satsuki)Clear Survival mode the eighth time.
9. Mitsuishi Kotono (Aoko)	Clear Survival mode the ninth time.
EX. Yuzuki Ryouka (Neco Arc)	Clear Survival mode the tenth time.


List of Unlockables

The following is a list of unlockable characters and features. Complete the game once to unlock Special mode on the main menu, from which you can review any CGs, endings, and voices you unlock through the methods below.
Unlockable              How to Unlock
Unlock Character CGs and Endings	Complete Arcade mode with each character
Unlock Extra Neco-Arc Voices	Complete Survival mode with Neco-Arc (do this 6 times to unlock all Neco-Arc voice samples).
Unlock Neco-Arc         Complete Arcade mode with all 20 non-secret characters (press START when highlighting Arcueid to select Neco-Arc).
Unlock Neco-Arc Chaos   Complete Arcade mode with Neco-Arc after unlocking all Neko-Arc Voices (press START when highlighting Nrvnqsr Chaos to select Neco-Arc Chaos).
Unlock Omake (Extra) Voices	Complete Survival mode with each character.
Unlock Special System Voice	Complete Survival mode with Hisui & Kohaku (the tag team character).


Unlock Neco Arc Voices

Default Neco Arc voice is done by Yuzuki Ryouka (Arcueid). To unlock extra Neco Arc voices done by other voice actors (selectable in the Special menu), repeatedly clear the Survival mode (meaning win 22 matches and go through the entire roster of playable characters) with Neco Arc.
Unlockable              How to Unlock
Hitomi (Akiha)          Clear Survival mode the second time.
Kouzuki Miwa (Miyako)   Clear Survival mode the third time.
Mizuhashi Kaori (Len)   Clear Survival mode the fifth time.
Natsuki Rio (Sion)      Clear Survival mode the fourth time.
Sakuma Kumi (Ciel)      Clear Survival mode the first time.