Diamond is Unbreakable - Chapter 55 
Let's Go to the Manga Artist's House, Part 3 (漫画家のうちへ遊びに行こう その③ Mangaka no Uchi e Asobi ni Ikou Sono 3), originally Stolen "Memories"! (奪われた『記憶』！ Ubawareta "Kioku"!) in the WSJ release, is the fifty-fifth chapter of Diamond is Unbreakable and the three hundred twentieth chapter of the JoJo's Bizarre Adventure manga.
After reading some of Koichi's memory and his adventures with the Stands, Rohan says that he will take off his memories and that they will serve as inspiration for his work. Koichi then uses Echoes ACT2's power to attack Rohan, but all of his attacks miss due to the fact that Rohan used his Heaven's Door ability to write in Koichi's memory "I cannot attack the manga artist Rohan Kishibe". Rohan reads Hazamada's memories as well, but discovers that he is a terrible person and none of his readers would like a character like that.
Koichi questions why Rohan would do this, saying that he is already famous and rich even without reading his memories. Rohan replies saying that he doesn't write manga to be famous and rich, but to be read. Rohan then rips off part of Koichi's memory. Remembering nothing that happened there, Koichi and Hazamada leave Rohan's mansion satisfied with the visit. Koichi later discovers that he lost 20 kg (44 lb) on that day.