Also known as: シスターテト, 向重音忏悔吧
A derivative of UTAU Kasane Teto as a Nun, created by Sidai Rusk Uu.
The artist also made a short Animated version consisting of a Fake Screenshot with dialogue and asked fans to make music to go along with it. Many fans did so but the most prominent version was made by Haibara Memory. Their song ended up being expanded to a full length Synthesizer V song titled Confession To Sister (Synthesizer V) with a music video animated by Sidai Rusk uu.