Tragic step siblings.
This is probably like every other perverted family story you'll encounter. Dark secrets abound, although you'll pretty much guess what's going on. You, the viewer, get to "solve" who raped and killed whom...chase all the leads towards the cause of Shuichi's mother's death and eventually wring justice for your family’s memory. Despite the fact that this isn't a comedy, you may just find amusement from this title's premise: New professor starts ravishing every other girl in the campus to get to the bottom of his personal mystery. But then he encounters...Acid Pussy™!
Seriously now, for the first 53 minutes of Wicked Lessons, there's nothing much in terms of plot that a veteran hentai fan has not encountered yet. Even the sex scenes are just your standard H fare — blow jobs, dildos, kendo swords (which substituted for the usual mop handle this time), blackmail and other common h-anime methods. And like every other standard H fare, the rape victims start clamoring for the protagonist's cock five seconds after he violates them. He also manages to turn the tables on three campus bullies, which would probably fill the fantasies of men who had been tormented by stronger girls when they were still in school.
The last 4 minutes, however, salvages what could've been another forgettable title. It's not a groundbreaking ending, but it's bittersweet. Frankly — because I had become one cynical bitch when it comes to hentai — I didn't really expect Wicked Lessons to end this way.
Moving to the artwork and animation, Shuichi looks good. The females, with the exception of dark-haired Shirone, need a bit of improvement. Not a bad hentai package overall, but I suppose it just needs a few more episodes in order to help flesh out the characters further.