I'm going to be rating these manga on a 7-point scale, with 1 being terrible and 7 being excellent. On this scale, 4 is an average score, a series that I though was okay, similar to something rated 7/10 on MyAnimeList.

I'm going to be categorizing the amount of fanservice using the movie-rating scale. G means very little fanservice. PG means like a normal anime amount of fanservice. PG-13 means a lot of fanservice, something I would put in the "ecchi" genre. R means a lot of fanservice, plus they show nipples. X would be hentai, but I haven't included any of that here.

Sayonara Peter Pan

• https://www.mangadex.org/manga/24674/
• [PG]
• 7 out of 7

In this world, all children are raised in a shrunken state, although they don't know it. Those that are deemed fit to be adults are grown back to normal size, none the wiser. Those that aren't are...disposed of. How can a group of escaped, tiny children hope to fight back? With a human-sized robot, of course. A very dark series overall.

I initially didn't think I was going to like this, since I was told it had hard crush in it and that's pretty far outside my strike zone. But it's actually just an amazing manga in general, something I would even recommend to my "normal" friends, not just on a fetish site.

Gokudou Parasites

• https://www.mangadex.org/manga/48320/
• [R]
• 6 out of 7

A hilarious story about a mob boss who gets shrunken down and is taken in by the female police officer investigating him. The humor is on-point, the fanservice is good, and there's even some pretty good action scenes.

Fukinoshita-san is Small

• https://www.mangadex.org/manga/44408/
• [G]
• 6 out of 7

This is actually a M/f story, which usually I'm not into, but I make exceptions for things that are exclusively fluff. It's just a short, cute story about a guy who's sensitive about his size and a girl who's like 4 inches tall.

Girls Have Their Reasons (Wake Ari na Kanojo-tachi)

• https://www.mangadex.org/manga/50068/
• [PG-13]
• 5 out of 7

What's the only thing better than giantess manga? Giantess yuri manga of course. This series has a cute vampire girl and a cute giantess girl, what more could you want?

Oversized Sextet

• https://www.mangadex.org/manga/41070/
• [R]
• 4 out of 7

A purely fanservice-focused manga about a short guy who attends a magic/adventurer school for various giantess races. A great series to turn your brain off and enjoy.

Small Girl Nozomi and Big Girl Yume

• https://www.mangadex.org/manga/36599/
• [PG]
• 4 out of 7

A story about a high-school girl hiding out in the room of a female NEET, borrower-style. This manga is still ongoing, with 10 chapters translated at the time of writing this.

The Female God of Babel

• https://www.mangadex.org/manga/43829/
• [PG]
• 3 out of 7

This series is kind of wierd. It's basically about a giant high school girl with god-like powers that rules over a...tower of club buildings. It's kind of like Haruhi Suzuimiya in that the main characters have to run around appeasing the whims of a god-like entity so she doesn't get bored and mess everything up.

Godspeed

• https://www.mangadex.org/manga/13440/
• [PG]
• 3 out of 7

Without spoiling too much, this manga is kind of like The Promised Neverland: a bunch of kids being raised in an isolated compound for definitely not sinister reasons or anything like that.

I really wanted to like this series, but it's just too short to develop its premise well. It's only 10 chapters long, so it feels like it goes straight from the introduction to the final battle.

Honorable mention: My Hero Academia. Has one giantess character, Mount Lady, that appears semi-frequently. Also has an anime adaptation. A good series in general, but not much G/t content.