ɯsamʲi ɽeŋko (♫)
Renko Usami as depicted on the cover of Rainbow-Colored Septentrion
Telling the current time by looking at the stars and the current place by looking at the Moon (a living GPS).
University Student (Super unified physics major)
Renko Usami (宇佐見 蓮子 Usami Renko) is a student in the outside world, presumably in a college or university. She majors in physics and is very objective and logical in her approach to matters. Together with her friend, Maribel Hearn, she has an interest in what would be considered the paranormal. Their club, consisting of only the two of them, describes itself as a club for necromancers. However they don't do many of the things necromancers would normally be associated with. Instead, they investigate spirits and such. Specifically they're interested in Gensokyo and seem to be among the few, or even the only, humans in the outside world who know of Gensokyo's existence.
As a physicist, she has a more scientific and rational point of view, which contrasts with Maribel’s, which is more fantastic. These differences sometimes end in conversations about if what Maribel dreams about is real or not. She seems more decided and energetic than Maribel, as it is her who normally takes the initiative on what places to visit.
- Telling the current time by looking at the stars and the current place by looking at the Moon
Renko can check the exact time with a precision of seconds and find her location or where a photography was taken just by look at the Moon and the stars. 
According to Changeability of Strange Dream, she studies super-unified physics, specializing in "strings." According to Retrospective 53 minutes, she lives in Kyoto like Maribel does, but her actual home seems to be in Tokyo.
Her full name is Renko Usami (宇佐見 蓮子), where both the given name and surname are actual names in Japanese. The kanji for Renko (蓮子) literally mean "lotus child" respectively; the -ko is a common suffix in Japanese that's used in female names.
Renko usually wears a black hat with a bow, white suit, and a brown dress. In Magical Astronomy and Trojan Green Asteroid, she is also wearing a black shawl. She also has brown hair and often carries a book with her.
- Ghostly Field Club
- Changeability of Strange Dream
Merry is talking with Renko about how she is visiting a strange world in her dreams. It starts out nicely but begins to become nightmarish as Merry is attacked by youkai. Merry has trouble figuring out what is reality and what is just a dream, and to further complicate the issue, she presents Renko with some of the items she had obtained in her dreams. Renko realizes the truth, and in the end must decide on which will be Merry's reality.
- Retrospective 53 Minutes
In Retrospective 53 minutes, Merry and Renko were on a train to Tokyo. They were looking at a simulated kaleido screen of the outside and discussing the trip, the view, and the nature of objectivity and subjectivity related to it. Renko commented on her, saying "You might be as carefree as the Tōhoku people though". The trip lasts 53 minutes.
- Magical Astronomy
The university campus is abuzz with news of public tours to the moon. Merry and Renko talk about the world on the moon hidden from humans and eagerly try to plan their own trip to there. Merry gets a special idea.
- Trojan Green Asteroid
Maribel and Renko discuss the lost micro-habitat space station TORIFUNE, Merry claiming that she has seen inside it and everything is still alive. Since the station contains a shrine to Ame-no-Torifune, they travel to another such shrine and use Maribel's ability to transport themselves there through their dreams. They discover that the interior has become a dense jungle, and are attacked by a chimera. Maribel wakes up with a cut on her arm and is sent to hospital.
- Neo-traditionalism of Japan
While in hospital, Maribel is diagnosed with sleepwalking and hallucinations; believing this to be a previously unknown virus, the doctors send her to the mountains for isolation treatment. By the time she's released her powers have grown stronger and she now sees visions while awake. Merry discusses Hell with Renko, but doesn't tell her that she physically travelled to Hell while in isolation. Renko tells Merry that while she was in isolation the news has been talking about discoveries of stone tools more than 25 million years old, though they were dismissed as a hoax.
Merry believes otherwise, and presents one she found herself. Merry shows Renko a vision of the underground realm where she found it, and Renko recognises the Ame-no-Sakahoko as being there. Merry calms down, no longer believing the place she saw to be Hell but the world of the gods. The two decide to find more such "Izanagi Objects" that lie unrecognised across Japan.
- Dr. Latency's Freak Report
At Maribel's suggestion, the duo is planning on self-publishing a book, in which they would relate the stories of the mysterious worlds they had seen. Under the pen name of "Dr. Latency", Maribel is dictating to Renko her parts of the book, including a summary of the strange places she saw as well as her theories in her attempt to rationalize what was defying the common sense of the world.
- Dateless Bar "Old Adam"
Renko invites Maribel to the "Old Adam" bar, a special place where old-style alcohol is being served and said to be a gathering spot for those who can see illusions. Almost everyone there seems to have read the Swallowstone Naturalis Historia, the self-published fanzine Maribel and Renko made before, and believe its content entirely. The duo came here to hear the stories of the locals, hoping to find valuable information or even people that may have special abilities like them.
Renko and Maribel Hearn are the only members of the Hifuu Club and both are fellow students at a university. The two are very good friends, working together to seek out other worlds, travelling by train together to Renko's home-town, discussing going to the moon together, and Maribel confiding to Renko about her travels to another world in her dreams.
Because Sumireko Usami shares Renko's surname, has a similar appearance, and as she created the Hifuu Club that Renko is part of, there is likely some sort of relation between the two. However, the specifics of this connection is as yet unknown. Sumireko's profile suggests Renko descends from the former.
- Regardless of the place she is at, with her ability to tell the time by looking only at the stars, she can only tell the current time in Japanese Standard Time (JST). If she wanted to know the Coordinated Universal Time (UTC), she would have to do the necessary calculation.
- Regardless of the presence of absence of scenery in a photograph, in Ghostly Field Club she was able to tell where a photograph was taken due to the projection of the moon in the photograph.
- In both Ghostly Field Club and Changeability of Strange Dream, she was the one who was late for the meeting with Merry.
- Renko is one of the only characters known to live outside of Gensokyo. As such, she has never actually met any of the other characters except Maribel Hearn, who also lives outside Gensokyo. Yuyuko Saigyouji has encountered the Secret Sealing Club on a visit to the outside world, but Renko did not seem able to see her. 
- ”Merry said that dreams and reality are the same thing, but that couldn't be. Even with that common sense of relative psychology nowadays, it is to the very end a matter of one's mind, and if objects from a dream show up in the real world, that would be a big problem. It's against the Law of Conservation of Mass. What would that do to entropy?” - Renko Usami - Changeability of Strange Dream
- Ghostly Field Club
- Symposium of Post-mysticism - Part 2
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