Immoral Study

, is a series of three Japanese adult games originally made for PC-98 computers, but later re-released for Windows 95. The series is by the studio Scoop Software Productions and the scripts are written by . The first two games were later released in English for Windows by Himeya Soft.
Release history
Scenario 1
was released for PC-98 computers in August 1995, and for Windows 95 on September 20, 1996.
Scenario 2
was released for PC-98 on September 22, 1995, and for Windows on October 18, 1996. Unlike the first game, where the story was linear, with only one ending, the second game featured multiple endings. The player takes the role of Professor Hitosuji, who was hired by a businessman to tutor his daughter, who's been slipping in her grades lately, she also has gotten an attitude problem since then. She's supposed to marry a person with a good education, someone who could organize her father's factory. She's in love with a student called Takashi and the professor uses her feelings towards him to have sexual intercourse with her.
Scenario 3
was released for PC-98 on October 20, 1995, and for Windows 95 on November 22, 1996.
Characters
;
:The protagonist of the series. He has the ability to turn any student to a straight and hard working one.
;
:The heroine of the first game.
;
:The heroine of the second game, she's the daughter of a factory CEO and she's got a bad attitude.
;
:The heroine of the third game.
;Takashi
:A boy who works as a cleaner. Yuka is in love with him.
;Sakamoto
:Yuka's bodyguard.
 
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