The leader of the tennis club, Kaori Kitamura, has recently had a problem with another student, Ami Sasaki, who regularly skips practice. One day, the club manager asks her to go to the problematic student's home to check on her. On the way, her childhood friend Seiya warns her that Ami's been out of control recently. However, being the club leader, Kaori believes that she can convince Ami to return to practice. There's a problem though. With Ami's heart no longer invested in the club, Kaori, once her absolute leader and ace of the club, had in Ami's eyes become nothing more than a regular girl one year older than her, thus Kaori's words aren't able to convince her. On the contrary, she has a cruel idea. She wants to make Kaori fall from her blindingly bright world, into the scummy one that Ami now inhabits. She uses her own fuck buddy to abuse Kaori and carries out her plan. This is the beginning of Kaori's fall.
 
(Source: Circle)
 
Note: It has live-action AV adaptations: NIMA-030 (2024/08/02) and NIMA-052 (2025/02/28).

"Nozomi Hayakawa" moved to an apartment due to her parents' divorce.
 
She's got a modest appearance and an air of absent-mindedness about her, but she's a member of the Tennis club who's already competed at the national level. But even a player of her caliber has a problem: the balance between her studies and her club activities.
 
As the days go by, she puts more and more hours into her club activities, but on the other hand, her grades have also begun to slip, little by little.
 
In the midst of all that, at the apartment she and her mother moved into, the man living next door happened to be a teacher, and so he started coming over during his free time to help Nozomi with her studies.
 
Besides being a school teacher, the man also had experience in advising a tennis club at the school he works at. Because of this, the Hayakawa mother and daughter started becoming less reserved around him, and he steadily gained more opportunities to watch over Nozomi's progress.
 
And so, one day. 
Her mother had to go to work on what was a day off, and this became an instance when Nozomi was alone with the man. Under the pretext of giving advice, he made a suggestion to Nozomi on how to greatly improve her concentration, supposedly to help her study much faster.
 
A "Hypnosis Set-up Video" was being shown on the laptop he handed over to her.
 
Nozomi continued watching the video without realizing anything... 
From there, it was becoming clear that this was all about her constitution and her body. 
The man had started it all for the sake of turning Nozomi into his ideal cocksleeve.
 
(Source: FANZA, translated) 
Note: A live-action AV adaptation (MIMK-187) was released on January 21th, 2025.

Kaori, the ace of the tennis club, just went to see her junior who has not been showing up at the tennis club recently... After her boyfriend, Masaya, shows Kaori to Ami's home, she finds Ami sucking a man's cock. Ami's sexfriend Ryou attacks Kaori and she loses her virginity. She calls out to Masaya for help, but her voice does not reach him... Ami has a stimulant that increases Kaori's sensitivity and she falls into a pleasure she has never experienced before..! 
 
(Source: Lune-soft, translated)

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