Volume 1:
1-2. Don't be Cruel, Please (Hidoku/Tsumetaku Shinaide)
3. After School Secret (Houkago no Himitsu, 放課後ヒミツ)
4. Love the Selfish, Too (Wagamama mo Aishite, ワガママを愛して)
5. Hindered by Underwear (Pantsu de Ojama, はんつでおジャマ♥)
6. Don't Take Off the Sailor Uniform, Please (Sailor Fuku wo Nuganaide, セーラー服を脱がさないで★)
Volume 2-3:
Deal with Maya and Nemugasa's developing relationship.
Volume 4?:
Concludes Maya and Nemugasa's relationship and deals with Jutta (Maya's cousin) and his relationship with his teacher.

Shunpei and Fumi are best friends and neighbours. One day, Fumi tells Shunpei he might be gay and has agreed to go out with another guy in school. Shocked at this sudden confession (but very accepting), Shunpei questions Fumi about all sorts of things regarding his newly-discovered homosexuality - subtly aware that he's disappointed that Fumi picked someone else over him - and, upon meeting the boyfriend, cannot take that Fumi chose someone who was more or less normal... like Shunpei!

From Vices and Devices:

Yumeji has a big problem, and no, it's not that he's gay (for now, anyway). Despite his good looks, excellent grades, and talent for sports, he's not getting any, and it has everything to do with the fact that he's impotent thanks to a traumatizing event back in middle school. Nothing seems to help, and since Viagra is apparently not a viable solution in Japan, he's practically lost all hope--until he meets underclassmen Seiji, who's violent, tactless, and says whatever is on his mind. Conveniently enough, he's also in love with Yumeji.

3. Koibito Kijunchi
Mu's in love with his best friend Maru, but Maru doesn't take him seriously because, well, Mu's a huge slut who will sleep with anything that moves. So Maru suggests an "endurance contest": he'll sleep with Mu if Mu can hold out for ten days without sex.

Reno has a new roommate, his name is Roje, and there seem to be a lot of nasty rumors about him in this boys' school. They call him "Casanova", he sells his body to almost anyone willing to pay for it. Reno is surprised to find that, for Roje, this is only business; transaction is over when people get the wrong idea about something that's just sex. Reno just wonders how is that such a nice person can be so cold at times, why is it that he can do those things as if it means nothing? and why he can't get close enough even when they are friends...naturally, curiosity becomes a heavy load.
Will Reno be able to suppress these feelings? Especially when Roje seems to be interested in nothing but money... (Source: Queen2408)

Series of stories revolving around dormitory boys in a all-boys catholic school.

After Yunogi-san's grandmother passed away, he sold the farm and his possessions and went to Tokyo. But the 34 year old Yunogi-san soon discovers that his lack of experience will not get him a job. He was thrilled to get a call one day about a position. After being forced into the position, he learns he is to become the publicly viewed substitute for horror writer Kirino Shuusuke.
(Source: mangatraders)

From Psycho Pandas:

A story about three men code-named Ace, King, and Jack, who work together at the Triple Detective Agency, and the man who wants to break them apart by taking Jack to New York.

An original manga by Nekota Yonezou based on the movie by the same name.

Amami’s a low-man on the totem pole at a tiny start-up firm—and his superior Hachidori really seems to have it out for him. They’ve got history themselves, which helps nothing, but one evening, Amami learns Hachidori’s deepest, darkest secret…which tilts his impression of the guy on its head.
(Source: MU)

Series of self published stories related to Hidoku Shinaide.

We are not sure about the timeline in Yasashiku Shinaide doujinshis and they're still sophomore. Sensei made these DJ before she finished volume 2, but all the doujinshis Maya x Nemu relationship is lovey-dovey! Perhaps they've became lovers in doujinshi?

When Kobayashi Jiro, a 28-year old physics teacher asked his student, Atana, to try applying for K University, Atana said he'd do it... Only if he can see Sensei's crying face?!

Schoolboy romance starring popular Daijuu and his mood-swinging boyfriend Kan. Kan desperately wants to be the one in control in the relationship, but slowly comes to realize their dynamics will never mesh that way.

Chapter 4/Oneshot from Hidoku Shinaide