Twin brothers Sui and Ruri begin a relationship with their teacher, Usami.
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EP.2 Chapter 2_ Chapter 2
EP.1 Chapter 1_ Chapter 1
EP.3 Chapter 3_ Chapter 3
EP.4 Chapter 4_ Chapter 4
EP.5 Chapter 5_ Chapter 5
EP.6 Chapter 6 + Prologue (END OF VOLUME ONE)_ Chapter 6
EP.7 Oneshots_ Volume 2 Chapter 1
