After the first dark area and going down the stairs, there should be a second dark area where the bat will chase you into the lighted area. She gives you darkvision, use it in the first dark area.
Most Debonosuu games(and some later Studio ego! ones) require you to have date and time format in JP, change it under Control Panel/Region & Language/Format. Do that, and it works fine with ITH 2.3.
Although if someone could tell me how to get past that berserk in the arena, it would be...
Re: [120727] [でぼの巣製作所] 紅神楽 -くれないかぐら- Dummy Cut + Update 1.01b [H-Game]
You need to buy summoning charms from the warehouse, carry them(also in the warehouse), then you get the summon option under techniques. You can also capture monsters and heal this way.
Also, if anyone else is getting...
This is my partially finished save file, I only finished a few routes(Akira,Setsuna,Yuni) before losing interest. But if you want to start a new game+ with 2 NLOS-C and a ton of sengoku characters, this is it.
Hopefully, it should work if you unzip into your otosen3/save directory.
Also...