Marcel Proust's «À la Recherche du Temps perdu» (the whole set of seven volumes in one!)

Taken from Jmanga:

An existence that transcends time and space! One day, a man takes a bite out of a cake he was having with some tea and suddenly experiences a strange sensation that revives memories of his boyhood. Follow the protagonist as he sets out on a lifelong journey of growth and change, and at the same time gain a glimpse into the world of French high society around the time of the First World War. This is the manga adaptation of the mammoth novel that revolutionized 20th century literature and philosophy with its unique vision of time!