Shindou Eruko, a glasses, big breasted beauty, found a job as a handyman for the Amaguri Handyman service after her NEET life comes to an end as her savings ran out. She immediately falls for her co-worker Hoshi-kun on their first day working together, but there's a problem: Hoshi-kun is a high school boy, while Eruko is a 27 years old onee-san who has trouble telling reality and delusional. She ends up constantly scheming to get close to Hoshi-kun to turn many of her delusions into reality...

This manga takes place after Vol.14 in Henjo - Hen na Joshi Kousei Amaguri Senko

Oka Shirou (22) is on his last day as a Computer Science university student and he finally works up the courage to chase after a High School girl he often sees on the train reading a programming book. As he reaches out, he grabs her bag and accidentally spills the contents. Music player, books, and a...SEX SLEEVE?! The girl snatches it and darts off with tears in her eyes. Oka resolves to leave the failed encounter in the past and focus on his new job as a System Engineer. Little did he know, he would meet the girl once again...

(Source: MU)

Amaguri Senko is a high school girl with a cool personality (as in, kuudere) and a big pervert. She openly reads porn and masturbates, and isn’t perturbed in the slightest at the sight of penises and such. The story is about two adult men that come to live and work for her father, who runs a company that does various oddjobs, which she helps out with. And the various forms of sexual harassment to which she subjects the one which she has taken a liking to.

20-year-old Aihara Minoru has come to Tokyo to make his dreams of becoming an action manga artist come true. To his amazement, he lands a job as a live-in assistant of his favorite mangaka, Takakura Kenji, who writes a popular fighting manga called "Ultimate Banchou."
Upon arriving at his new workplace, however, he discovers that his idol is not the tough guy he'd always imagined. The truth is, Takakura Kenji is the pen name of Sekai Ichiko, a girl his age who is basically a moe character (she looks and acts like a little kid). After Aihara's obvious disappointment starts them off on the wrong foot, it's going to be tough for him to prove to her that he has what it takes to be a manga artist!
(Source: MangaHelpers)