Ikumen After
This is The Happiest Story. Two single dads meet in the mornings dropping their sons off at school. The sons are dear friends, and the dads grow close, helping one another to cook and manage their lives. When one loses his apartment in a fire, they combine households temporarily out of necessity, and it becomes harder to hide feelings for one another. The dads are great, but the kids MAKE this story. They're adorable. Be aware that Kentarou works in porn at one point, and having sex with someone else is part of that work. He sees it as work and so does Asakura.
Renai Moratorium
An AV actor escapes unwanted attention in public by kissing the person nearest to him - which happens to be the class president from his middle school days.
Calling (OOTSUKI Miu)
A salaryman leading an ordinary life stumbles across an AV set and meets the love of his life.
Kitto Koi ni Chigainai
Two stories: coworkers in love, and a man who agrees to be in an AV to spare his (stupid) younger sister, and eventually falls for one of the actors.
Hakidame to Tsuru
Ten years after escaping AV, which he fell into paying off debt after being left by his Yakuza lover, 35 year old Kei is working part-time jobs to make ends meet. At a movie theater, he meets Junta, 12 years his junior and earnest in his love, but Kei's past is not something he's willing to share and he's afraid to fall in love again.
Eden no Uragawa