Based on the doujin manga by Kemigawa.

A baseball team manager will do anything to help and protect her teammate boyfriend, including taking sex education classes with her coach.

Yuuta Yamano and Shinomiya Natsuha are dating. But it seems that he has no idea that she is hiding a secret relationship that gives her more satisfaction than dating him. (Source: PageHentai)

Based on the adult PC game by Orcsoft. On the 2nd anniversary of the marriage, Takahiko realizes that he is no longer getting sexually excited with his beloved wife, Manami. He is aware that this impotence is because of the strange custom he witnessed in his hometown, where a naughty feast takes place every night in the dark throughout the summer festival. Long ago, he ran out of his hometown, horrified, but now he realizes that he can cure himself only by going back to that place… Beloved young wife and the beautiful step mother he adores, pant in the pleasure given by someone else! The lewd netori festival of night begins… (Source: DLsite)

Fukaya accidentally breaks Fujino’s vibrator so he takes her to a sex shop to get another. While there, they have passionate sex in the dressing room and Fukaya mentions how quiet she is and how she never needs to be less quiet when they do it in public. Fujino comes to the conclusion that she needs to be louder for him and tries to get Mita to help her, while the Nurse has to tell Fukaya why Fujino is acting differently.

By chance, Fukaya became the lover of a very quiet and beautiful girl, Fujino, yet he worries about the vibrator she’s always carrying. “Perhaps, she considers me no more fondly than that vibrator?” In fact, their relationship began when he found her using a vibrator aboard a crowded train. Although they have passionate sex, he can’t be certain that she loves him, and feels threatened by her vibrator. Now, the two of them are going to a pool. As she will be unable to use the vibrator in the water, he expects they will be alone, but… (Source: AnimeNfo)

Mie happened to pick up medicine that an old man dropped. When he took the medicine, his figure disappeared. Soon he went to a public bath to peep, and began to molest. Then, he went to an all-girls school. (Source: AnimeNfo)

Hero Hajime is going to school with Misa and Megumi. He loves Megumi, and asks Misa if there is a way to win Megumi over. Misa produces a pill that is supposed to make the taker reveal their exact feelings for someone. It turns out Megumi has been wanting Hajime, but so has Misa.