When the young girl Mana Hinoki arrives in Toykyo, capital of Japon (there are no typos), she stumbles across a young boy named Showtaro and quickly discovers that he is a "Clown": a human who awakened a special power, but has to stick to a specific condition. Showtaro can use the powers of various animals by biting one of their bones, but in exchange has to accomplish at least a good deed every day. After a little incident, Mana accepts to help Showtaro in his search for his best friend Emine. They are soon joined by Yowhey Nanami, a genius inventor who is chased by the Fear Factory, an evil firm for which he build a (defectuous) giant robot.
Published between 2002 and 2003, B.Ichi is the first, not so successful manga of Atsushi Ookubo. You could say B.Ichi was to him what Zombie Powder was to Tite Kubo. After Ookubo went and wrote Soul Eater, a much longer and much more successful series, this one fell into oblivion and is almost unknown even in Japan, but you could already find a few of the recurring graphic motifs of Soul Eater (like the skull). The series's characters, technology and environments have a rather peculiar design, and it doesn't take itself too seriously most of the time. The arstyle is also quite different from the one the author would adopt in his next work.
Tropes featured include:
- Aborted Arc: All this talk in chapter 2 about "4 powers needed to fight the darkness"? Yeah, it's never mentioned again. Also, the entire Gathering of the Masks arc was aborted due to the series being cancelled.
- Art Evolution: Not striking since the series is only 20 chapters long, but the faces are noticeably more rounded in the late chapters.
- Big Bad: The Hakutaku sort of. Considering Emine is forced to be the bad guy because of it.
- Bookends: The very first color page is Showtaro sitting on a crooked branch, holding a giant bone, with a graveyard-like landscape in the background. This is also the last scene of the series.
- Defense Mechanism Superpower: Originally at least; Clown powers are dormant within every human, but can awaken when one is mistreated by those around them.
- Explaining Your Powers to the Enemy: Usually averted, except with Lin and Shinoda in the fourth volume. Not that it prevents them from crushing the vice-president effortlessly.
- Exposition: Done more or less subtly in the dialogue, on a regular basis.
- Fantastic Racism: The fear and hatred of Clowns is so strong that the governement of Japon has built a unit specifically to eliminate them. In response, a number of Clowns have united under the Clown Alliance to destroy humanity.
- The Ghost: The Fear Factory's president is mentionned only a few times and never appears (he was apparently badly injured when Yowhey's robot slammed itself in the factory's building). The vice-president is the acting Big Bad during the Fear Factory arc.
- Mega-Corp: The Happy Factory, a giant electrics company; it's real nature is the Fear Factory, a firm specialized in building war weapons.
- Multiple Reference Pun: The author himself notes that, while the title refers to the word "bone" (the B) and the concept of "one good deed a day" (the Ichi), you can also separate the word "Bone" to make "B.One", which means the same thing as "B.Ichi". And according to him, it wasn't even intentional.
- 90% of Your Brain: The Clowns; although their powers usually don't have anything to do with using more of their brains.
- No Ending: Due to being Cut Short (most likely). The series was probably not planned to be very long since most of the important questions are answered − although vaguely −by volume 4, but the series stops just before what looks like the final battle, and there are still quite a few threads Left Hanging.
- Parental Abandonment: Showtaro and Emine are both orphans, and it seems Mana was neglected by her parents (it's probably the reason she left home).
- Pint-Sized Powerhouse: GET, the small robot designed by Yowhey for Mana, can pack enough punch to demolish robots twice its size in the Robot Fight Tournament. Incidentally, Mana herself can qualify.
- Pun: Tons of them, from various characters, and often untranslatable.
- Red Baron: The most powerful Clowns usually have a nickname. Showtaro is the "Kyōkotsu" (the Mad Skeleton), Emine is the "Hakutaku" (a mythical beast with 8 eyes and a lion-ish body), Nofix is the "Kaiten'ō" (King of Spin), etc.
- Show Within a Show: Charisma Justice, the adventures of an invincible and very hammy superhero. Showtaro is a big fan of it.
- The Smurfette Principle: There are exactly 3 female characters, and one of them has only a few pages of screen time. Lin's appearances are pretty scarce too, making Mana the only remotely important female character in the series.
- Spell My Name with an "S": Even the Japanase-looking names written in Kanji turn out to have a completely weird spelling, making the orthograph of most of the names dubious.
- Static Character: Almost everyone, including Showtaro, which may be part of what doomed the series' chances of success. The only character who gets any significant development is Yowhey.
- Superpower Lottery: Not only the powers, but also the conditions can be pretty much anything. It can range from cool ("one good deed a day") to mundane ("regularly bathing in light") to funny ("breathing in a ridiculous way") to thoroughly life-ruining ("one evil deed a day").
- Swiss Army Weapon: Law-Abiding Silver Gun can shoot normal bullets, freezing bullets, be used as a Grappling-Hook Pistol, or transform into a freaking Wave-Motion Gun.
- Xtreme Kool Letterz: Showtaro and Yowhey's names are prime suspects.