Shingeki no Eroko-san Manga

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 delusions apart. She ends up constantly scheming to get close to Hoshi-Kun to turn many of her delusions into reality...