Onigokko is a high-quality fantasy charage that was amongst the second fifty I played after I began plowing through untranslated VNs.  Unlike many I read during that time, I find I haven't really forgotten anything significant, so it turned out to be a bit harder to get into than I expected, even after half a decade.   That said, it has a lot to recommend to it, even today.

The story focuses on the protagonist, Keisuke, who is also the Phantom Thief, Ura.  He and his family have been stealing magical treasures and using them to do good for over a century, and he is the third generation to take on the mantle.  He is unable to lie for the most part, but he is surprisingly good at misdirection.  His straightforward and honest personality make him an easy companion for the heroines when they don't know he is a Phantom Thief, and the Phantom Thief persona is also fairly likable, if you don't happen to be a victim, lol.

Anyway, this story focuses on Keisuke's pursuit of the false Ura and his daily life on an island ruled by the descendants of Momotarou, Kintarou, and Otohime of Japanese legend.  His own family is on bad terms with theirs, as they prefer to seal away the magical treasures made by the oni in the distant past, whereas his family utilizes them for the good of others.  It makes for some interesting conversations, lol.

Keep in mind, when reading Otome's path, that this is based in the same universe as Osananajimi wa Daitouryou (for some odd reason, translated into 'My girlfriend is president)) and Naka no Hito Nado Inai, which means things aren't so much pure fantasy as they are science-fantasy. 

Kureha

There is only one phrase I need to say to give you an idea of how I feel about this path... Kuu-nyan Moe!  lol 

Seriously, nobody does tsundere loli characters like Aoba Ringo (the VA), and I found myself wanting to give her candy and pat her on the head at every turn.   Amongst Onigokko's heroines, she is the one I remembered the most clearly, and I spent most of her path waiting for the moments when she went dere or said 'Kuunyan yuuna!'

Did I mention that I love cats...? 

Anyway... her path is pretty long, with a lot of ichaicha (in the time when Onigokko was made, it was still fashionable to layer it on so thick it collapsed the cake beneath), and it actually has two climaxes, which kind of makes it a weird experience, since most VN heroine paths tend to have a single major climax.  I love her character, so I enjoyed it for the  most part... but the loli thing just doesn't attract me... 

Fandisc

Kureha's fandisc after-story actually occurs before the last part of her epilogue, covering a period roughly one year after the end of the main part of her path.  For ichaicha it is fine, but as after-story goes... I was hoping for something a bit farther down the line (like little Kureha children running around, driving her into tsundere fits).

Kana

Kana is a descendant of Kintarou (other name: Suzuka) who fought the oni on the island with a giant axe.  Her family deals with outside threats and searching for treasures outside of the island itself, as well as providing training for the security personnel (ninjas) for the other Three Families.  She loves archaeology in general and studying the ruins on the island in particular.  She is rather obviously infatuated with Keisuke from very early on, but her shyness makes her path a bit frustrating at first... particularly because Suzuka's existence kind of confuses things at key points.

I honestly liked her path as a story and I shed a tear for her ending.  However, I found the epilogue a bit unsatisfying in comparison to Kuu-nyan's. 

Fandisc

Kana's fandisc path should be read only if you have finished Otome's path in the original, since it basically spoils everything in Akari's and Otome's paths.  However, it also is really, really good as an extension of her story, bringing a conclusion to the promise made at the end of the original game and a wonderfully happy ending to the story.

Akari

Akari is Momotarou's descendant and the daughter of the current head of the family.  Her family controls the political end of the Three Families' business (providing a place to hold the treasures, as well as overseeing security) and dealing with internal difficulties.  Akari's issues are entirely wrapped up with her family's internal politics and the cost of their dedication to protecting and concealing the treasures.  She and Kuunyan could definitely fight it out for which heroine oozes sweet stuff the most around Keisuke in their paths.  Like most paths in charage of all types during that period, the romance part is pretty long and has a really long buildup (the same can be said for the previous two paths as well). 

Fandisc

Similar to Kana's path, the fandisc after-story for Akari provides a lot of nice extra details and a frequently amusing conclusion to her story.  It also fills in the details of what went on between the ending and the epilogue of the original game quite nicely for those who are interested.

Otome

Otome is technically the 'true heroine' of the story.  She is a busty, sweet, deredere senpai character with a love of hugging people.  She is a member of the Saionji clan, which is supposedly descended from Otohime.  Anyway, her path is mostly romantic... until it starts delving into 'where the treasures came from' and comes up against the common setting with My Girlfriend is the President and Naka no Hito.  It is actually a fairly emotional story, but while it falls into the realm of 'true paths', it doesn't really have more impact than the others, so you won't feel like you were gypped by the other paths.

Fandisc

Sadly, the fandisc doesn't really add anything to the story, really.  It is mostly ecchi, ichaicha, and day to day issues, and as a result it doesn't really feel like it adds anything to what came before. 

Aoi

お兄ちゃんの童貞は妹のものだって、法律で決まってるのに～～～！！  For those of you who can understand Japanese, this line says everything you need to know about Aoi. 

Anyway, her path exists only in the fandisc and was a gift to fans who voted her the highest-rated character in the game.  That said, I don't have much of a taste for Aoi... she is nice as a side-character, but I couldn't see her as a heroine even in her own path.  The whole thing falls out in a typical 'forbidden fruit imouto' path for the most part, without any really dark undertones (this was written by the same people who did Daitouryou, after all).  I really can't say that I'd bother playing this path again....