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August Star of Heaven
Name August Star of Heaven
Kanji 天津甕星
Rōmaji Amatsu-Mikaboshi
User(s) Reika Masamune

Amatsu-Mikaboshi (天津甕星, "August Star of Heaven") also known as the "Evil sword" (悪刀, Akutō) is a special weapon that belongs to Reika Masamune, a member of the Seven Ninja Swordsmen of the Mist. Originally not much was known about this sword, until Reika revealed that the Amatsu-Mikaboshi is indeed another variant of Orochimaru's Sword of Kusanagi, similar to the Tosaka Sword that was wielded by Itachi Uchiha through Susanoo. Like all variants of the Kusanagi, the Amatsu-Mikaboshi also possess a unique ability, and it has been described as being one of the most terrifying swords to exist in the world.


The Amatsu-Mikaboshi is a cursed weapon, having been tainted with the regrets and sorrows of those who have been bounded to the evil sword against their will. Unable to move on to the afterlife, all the negatives emotions from these souls accumulated within the sword, giving rise to its dark and sinister nature. Throughout the ages it has been used to commit many atrocities, having been forged as a weapon for mass slaughter. Many of its past wielders met their untimely demise, and as it was passed on from person to person it became more corrupt, to the point of being regarded as an Evil unholy sword. It has a dark and sinister aura around it, and at times it can even influence its wielder to a degree.



True Form.

In its sealed form, the Amatsu-Mikaboshi takes the appearance of a shikomizue (a blade hidden inside a cane). Because the sword itself resides within the cane, its hilt is still the handle of the cane, so it looks different from most swords. Both the handle and scabbard are sleek brown, which gives the entire sword the appearance of an ordinary walking stick.

In its true form, the Amatsu-Mikaboshi takes the appearance of a double-edged straight sword or jian, with a circular golden guard, and silver greyish hilt. There is a circular orb connected to the end of the hilt, which glows whenever a technique or attack is about to be used. At times a swirling mass of dark chakra may emanate from the sword.

Abilities and DrawbacksEdit

Sealed FormEdit

Lost souls

The Lost Souls bound to the Sword.

All those who are slain by the sword are forever bound to it, meaning that the spirits of everyone ever killed by the Amatsu-Mikaboshi are bound to protect the sword and by extension its wielder for all eternity. When used, Reika is able to manifest the spirits slain by the sword to aid her in battle, using them for a variety of purposes. Even though they are spiritual beings, they can still interact with the world around them, as the long they are bound to the sword. Despite the unique abilities bestowed by the sword, there are risks involved when using it, one such risk is that if the blade is used after an extended amount of time, the user will begin to hear the cries of the souls, according to Reika these cries are more than enough to make a normal person go insane, as such the sword needs to be sealed up with special tags at all times, in order to keep it stabilized. Except Reika, no one else is able to hear their cries of regret and sorrow. The Amatsu-Mikaboshi must be wrapped up in bandages with special seal tags placed on it, by doing so allows Reika to use the sword in battle without suffering the side effects.

Seal Tag

A seal tag for the sword.

According to Reika the sword seems to have a mind of its own, making it difficult to wield without properly mastering it. Another problem with the sword is that it must be compatible with the user’s chakra, in order to wield it. When Reika first received the sword, she had difficulty in using it, and had to constantly feed it chakra in order to properly wield it. In the beginning the sword absorbs the user’s chakra and attunes itself with it, thus allowing it to respond only to them. Any other individual who attempts to wield the sword would be unable to pick the blade up, as if it were being suppressed by a huge weight. Reiko had to imbue the sword with her own chakra over a long period of time, before it truly acknowledged her. Reika can feel the sword's evil presence without even seeing it.

Reika detests using the sword due to its evil nature, and will only wield it when facing against a stronger opponent. She keeps it alongside her at all time, wrapped up in bandages; this is to ensure that no one else tries to steal the evil sword away from her. According to Reika, approximately one hundred souls are currently bound to the sword.

Despite the challenges, Reika has over the years trained with the sword, mastering it to a certain degree. She has even found a way to increase the amount of time the sword can be used in battle. By imbuing it with lightning chakra, she can stabilize the sword for a short amount of time, and use it without succumbing to the effects of the sword. Reika initially had problems wielding the blade but after two years of training and feeding it large amounts of her chakra, she was able to wield the sword.

True FormEdit

Cane Sword

Dark Chakra.

Due to the evil nature of the Amatsu-Mikaboshi and in order to avoid being completely taken over by its dark influence, the previous owner of the evil sword placed a number of seals on its physical body, to ensure that future wielders of the sword may not fall under its control. In order to undo the seal, the evil sword must be drenched with the blood of its current wielder, in this case Reika Masamune, doing so changes the sword from its regular shikomizue form into something of sinister design.

In its true form, the wielder gains access to an even greater source of power and all of its previous abilities and techniques are enhanced to a greater degree. The user is now able to summon and control all hundred souls that are bound to the sword, and use them to set up for much stronger attacks. By drawing upon the bloodlust and hatred of its wielder, the Amatsu-Mikaboshi is now able to produce Dark Chakra (闇のチャクラ, Yami no Chakura), a special chakra formed from negative emotions. This chakra is shown to be extremely powerful, as it can be used to enhance the wielders own power and create more dangerous techniques.

With great power comes an even greater risk, since the user is now influenced by the blade when wielding its true form. The user will succumb to their darker impulses more easily, filed with bloodlust and an innate desire to kill, something which is commonly attributed to the evil sword. In battle the user act in a manner akin to a berserker, ignoring injuries and overpowering enemies with greater strength and force. The longer the true form of the Amatsu-Mikaboshi is used the greater the chances for the user to be completely taken over by it, as such it can only be used for five to six minutes at best, before the sword needs to be re-sealed again. Despite the true form of the sword being used only once, it can be seen just how significant the strain that it places upon the body is, as it caused Reika to nearly collapse upon resealing it. Not only is it exhausting for the wielder to use this from but also drains a significant portion of their chakra reserve. It gradually drains the wielder of thir life force.

Derived JutsuEdit

Reika has developed a series of unique jutsu’s which utilizes the power of the Amatsu-Mikaboshi. She has named these techniques, Kusanagi Secret Technique, due to her sword being a variant of the Kusanagi blade. By manipulating the souls that are bound to the sword, Reika is able to use them for a variety of purposes.


  • The sword is named after Amatsu-Mikaboshi (ja:天津甕星, "August Star of Heaven"), also called Ame-no-kagaseo(天香香背男, "Brilliant Male"), the god of evil and of the stars, specifically the pole star, in Japanese mythology. The Amatsu-Mikaboshi is not a physical god, but a dark force that existed before the universe.
  • The shikomizue (仕込み杖, literally "prepared cane") is a Japanese swordstick. It is most famous for its use by the fictional swordmaster Zatoichi.
  • This weapon has been approved by an admin