Tensei Ojisan, Heroine ni Naru.  

Reincarnated Old Man Becomes a Heroine., 転生おじさん、ヒロインになる。, Reincarnated Old Man becomes a Heroine

Ittetsu Wakigata-A simple, devoted individual who has spent over 23 years working in the corporate world. Although he holds a position of general manager at his company, during his free time, he enjoys reading manga. This salaryman lived a contented life despite its mediocrity. However, after being reincarnated into the realm of a Shoujo Manga, he found himself transformed into a high school girl and questioned how he arrived in this location. His beloved family was surely waiting for him to return home! Encourage this newly reborn uncle as you immerse yourself in this heartwarming tale filled with love and humor!