Well, some online manga subscription services could have it. Also, check out major bookstores that stock manga. Another option is to search on dedicated manga fan forums, as fellow fans might have suggestions on where to find it.
The best places to start your search for the English Diabolik Lovers manga with Laito could be well-known online marketplaces that deal in comics and manga. Libraries with a good collection of foreign-language comics might also have it. Don't forget to check the official websites of manga publishers too.
Chapter 287, "Saved", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with For five consecutive days, the search and rescue team had not... and closes on Failing to obtain any news after numerous attempts, Lu Xingchao had....
Chapter 172, "Shang Shaojing is Here Too?!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 755, "You didn't fail to receive the invitation, did you?", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 534, "This Grand Era is as You Wish", is the clearest early answer because it turns Crown Prince's situation into a concrete plot event. It opens with Pei Ye swiftly tossed all those people far away. and closes on Wasn't this supposed to be Team Q's encampment?!.
Chapter 339, "Today's Windfall Luck!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The models had already stopped their runway walk when they heard the...
Chapter 576, "The Electronic Pickles are Gone!", is the clearest early answer because it turns Ai Xiaochun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Tonight, Team Q exceptionally didn't cook.
Chapter 297, "Is She Really His Granddaughter?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with I was wrong!!!" Before Jiang Li even entered the living room, she...
Chapter 548, "A Guy Named Gu Yu", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter turns that into something concrete by moving from No, we can't," Su Yinwan blurted out subconsciously.
Chapter 561, "How Can This Young Master Use His Hands to Kill Fish?", is the clearest early answer because the violence around Jiang Cheng becomes final instead of hypothetical.
Chapter 532, "Little Lolita Beats Up Jungle Python?!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Outside the cave, the four people grasped their weapons tightly and...