I think the title has a wrong Kanji, unless I'm missing something. This is a sequel to a previous manga with a similar name, but that title had 夢妄想 (Wild Dream) and this one has 夢忘想 -- which uses the Kanji for "Forget" instead of "Delusion". "Forgotten Dream" might work, but I can't find a Forgotten Dream 1, and he's done "Wild Dreams" for many characters. The only similar one I can find is post #787429 - and that one was translated as though it were 薬妄想.

is 忘想 just another form of 妄想? What am I missing here?