First of all, LOL @ the idiot below saying that this manga gives off an impression of a 70s manga, when it is actually a 70s manga. 🤣
Anyways, like others have said, this is a very funny story. The author has an obsession with Hitler, so he deliberately drew the scientist that way (another fail for that judgmental guy), which turned out pretty good.
What I really liked is the main character, because I felt that I could really relate to him, wanting real love and romance as well as falling for every pretty girl. 😛 Also, at his age, I believe I also wanted marriage.
Although I dislike gender-bender (and shoujo, but I will get to that in a minute), the title uses the second least unacceptable kind (after having a girl dress up as boy), which is implanting a boy's mind in a girl's body, as opposed to disgustingly feminizing the protagonist like Aki-Sora or, to a lesser extent, Yomeiro-Choice and Seikon no Qwaser did.
As for the series being shoujo, there are two factors that separate this one from the rest of the sorry excuse for a genre; so much that I might be able to argue that it is actually shounen:
a) It follows a guy; that is better since his thought process is more logical than a girl's would be.
b) Finally, GREAT ARTWORK; I can not say this enough: That has always frustrated me in shoujo titles, using sketchy drawings and unrealistic body proportions (e.g., hands too big, chins too narrow, and big-ass wide eyes, etc.).
Despite this manga's not being as old as some of Tezuka Osamu's earlier gender-bender works, it is an underrated worthwhile gem.