[Tetsuna] Chain of Defilement Ch. 1 (Shikiyoku no Kyoushitsu to Ikenie Shoujo) [estradiol]

A senpai lures her nervous junior to the school's abandoned classroom, home of the legendary ghost teacher—and the sinister spirit wastes no time claiming the girl as his new plaything. Bound by a voice whispering inside her head, she is violated in broad daylight before oblivious classmates who cannot see her invisible assailant, left plugged full and trembling as he savors her helplessness. Just when she thinks it's over, another girl senses something lurking in the halls, and the ghost's chain of defilement is only just beginning.