The saddest mangas i have ever read must have been the Deep Love series. It consists of 6 manga and I think the two saddest are is Deep Love : Pao no monogatari/ ayu no monogatari , becausea big crybaby about dogs(the first one) and a sad semi love story that could never be true is always good(second one) ε: thx for rreading this :3 reply
