Hypermedy Haruko Nakajima

Follow the daily life of Haruko Nakajima, a young middle-aged woman who is a specialist in love.

(from ebookjapan):

Izumi Kikuchi 38 years old, single. She is a food writer. She has been in an adulterous relationship for 10 years. In Paris, Izumi met the most powerful and unconventional female president. Her name is Haruko Nakajima. Can Haruko create a storm in Izumi's stagnant life...?

Included in the book is a bonus manga.