Nanjo's death in Banquet

Axioms

• After Jessica was injured, Eva was constantly under Battler's supervision. Battler is neither the culprit nor an accomplice. By this, we can establish the perfect alibi for Eva.
• Kinzo is dead.
• Krauss is dead.
• Natsuhi is dead.
• Hideyoshi is dead.
• George is dead.
• Rudolf is dead.
• Kyrie is dead.
• Rosa is dead.
• Maria is dead.
• Genji is dead.
• Shannon is dead.
• Kanon is dead.
• Gohda is dead.
• Kumasawa is dead.
• Nanjo is dead.
• Those 15 are all dead.
• Battler is alive.
• Eva is alive.
• Jessica is alive.
• Eva was with you the whole time. So committing a crime was impossible for her. Of course, Battler-kun isn't the culprit. He wasn't forging an alibi for her, and he took the possibility that she was the culprit into account, watching over her actions carefully. No chance existed for her to do anything suspicious! In short, at the time of the crime, only Nanjo and Jessica were in the servant room.
• Ushiromiya Jessica has not committed murder! She was not involved with Nanjo's murder!! Her eyes were completely covered. It's be impossible for her to carry out a murder like that!
• Neither Eva nor battler killed Nanjo, nor were they involved!!
• The culprit who killed Nanjo was neither Battler nor Eva nor Jessica!!
• Jessica's eyes were completely covered, and murder was impossible for her!
• No action caused by jessica's body had any relation to or influence on the Murder of Nanjo! This also applies to Battler and Eva.
• neither Jessica nor Battler nor Eva is the culprit who killed Nanjo!
• Nanjo's death was a homicide. ...of course, it was with a direct method of murder, not a trap. A weapon was readied, and he was killed with it from point-blank range in front of him! The culprit appeared openly before Nanjo's eyes, and as they both looked at each other's faces, the culprit killed him...!!
• The one who killed Nanjo was definitely a human!
• A human, with their feet on the ground, held up a weapon and killed with it! Right before his eyes!

Corollaries

You just need one person not accounted for by the list to solve this completely, and because Kanon and Shannon are the same person, we are down to 16 humans, one less than the limit of 17.

The official culprit in our theory is Sayo, but it could be X Beatrice or anybody else.