Natsu to Lemon to Overlay

Sayaka Konno, a stunning office worker for a large company, asks voice actress YUNIMARU, who struggles to find work in her day job, to read her will at her funeral. Despite her reservations, YUNIMARU is intrigued by the sum of money and accepts the invitation. Dreams, daily life, and the wealth of life... Two people from different "layers" spend only one summer together, touching each other's wounds.
(Source: Ichijinsha, translated)