Mio's Memo: Hidden Ceremony
Obtained: Final Chapter, after entering the Rope Temple
People sacrificed to calm the Hellish Abyss's rumblings temporarily until the next Crimson Sacrifice Ritual are called "Kusabi". The ceremony for sacrificing a Kusabi was the "Hidden Ceremony". Village outsiders were subjected to the Cutting Ritual then made into Kusabi.
It was believed that the more pain the Kusabi was subjected to before sacrificed, the more effective it would be in appeasing the Hellish Abyss.
The very first Kusabi, a ceremony master, performed the Cutting Ritual on himself, slashing and cutting his own body.
Ever since then, the Cutting Ritual was part of the Kusabi tradition. Legend had it the villagers captured visitors to the village and forced them to be human sacrifices. This practice was probably the origin of the rumor the people who went near All God's Village got "spirited away".
MM:Hidden Ceremony
Mio's Notes: The Shadow Ritual
Obtained: Final Chapter, after entering the Rope Temple
When the Abyss begins to grow restless in the interval between Crimson Sacrifice Festivals, a form of human sacrifice is used to appease it. The victim is known as the Kusabi.
The Kusabi is prepared by means of the Shadow Ritual. An outsider who has come to the village is treated with the utmost hospitality, before being subjected to the torment of being ritually cut.
The belief is that the greater the agony inflicted on the Kusabi, the greater his power to calm the Abyss.
The first Kusabi was the High Priest of the village, who, suffering unendurable torment, inflicted the ritual cutting on himself.
This was the origin of the Shadow Ritual, where cutting the victim turned them into the Kusabi. Those used in the ritual were outsiders who were captured when they entered the village.
This is how rumours of people mysteriously vanishing in the vicinity of Minakami Village began...
澪のメモ：陰祭
紅贄祭の準備が整うまでの間、鳴動を始めた
虚を一時的に鎮めるための人柱を「楔」
（くさび）という。
その楔をつくる祭りが「陰祭」（かげまつり）
である。
陰祭は、村を訪れた客人（まれびと）を
手厚くもてなした後、その客人を「身削
（みそぎ）の儀式」にかけ、楔とする。
虚を鎮める「楔」は、苦痛を受けるほど強い
人柱になると伝えられている。
最初に楔となった祭主は、様々な苦行の果て
に自らの体を切り削ぐ「身削の儀式」を行い、
即身仏となった。
その後、村には「体を切り削ぐ儀式」が「楔」
を作る儀式であるとして受けつがれ、村を
訪れた客人を捕えては、むりやり即身仏
（楔）にしたという。
このことも、皆神村周辺に伝わる神隠しの
噂を大きくしていた。