Review for the whole series:

I read this series because of a video essay by ceicocat called "The Incel to Trans Pipeline and Inside Mari" which I highly recommend.

I read "Welcome Back, Alice" first, which I am glad I did because it really helped me understand the author's ideas about gender before diving into "Inside Mari." Inside Mari definitely feels like a gender exploration manga, but it isn't as straight forward about it as Oshimi's other manga.

This isn't your typical situational comedy gender swap manga (Ex. Ranma 1/2). This really feels like a more nuanced exploration of what it would really means to swap bodies with a teenage girl and all the stuff that would naturally come with it: complex female relationship dynamics, unwanted advances of men, social pressures of filling the role of a woman, school pressures, menstruation, etc. Not to mention at one point, it starts to feel somewhat like a trans narrative. The main character Isao Komori is struggling to decide if he wants to save Mari, be Mari, or just wants her sexually. It really reminds me of another manga, Until I Become Me by Satou Hatsuki which is another gender swap manga that slowly starts to take on a more trans story line. But Inside Mari feels a lot more abstract. The ending is honestly, ambiguous, and has more of a DID vibe which I didn't really enjoy. I would have rather it stayed more on the trans narrative track, but I also get that Welcome Back, Alice fills that narrative a little better so at least there is that. The "mystery" of where Mari is gets solved but its still pretty confusing.

This is definitely interesting. Not totally sure I would recommend but still pretty good.