Hi there. I will be writing about the currently(as of June 2017) most major arc of the tsugumomo manga and its build-up arc. I will assume that you have already seen the anime. You can still make sense of this even if you haven't though.

My goal in writing this is to hopefully get the manga some more readers. I don't care if you read it on piracy sites like KissManga, MangaFox, etc. But if you come to like this manga after reading it, it would be great if you can buy a volume or two of the manga in order to support the author.

The tsugumomo manga has three good points. First, the epic action scenes. You'd actually have to read the manga to understand this, for obvious reasons. Second, the lovely ecchi. The manga had A LOT of ecchi. But do not worry because it's not stupid ecchi. The male MC does not suddenly trip on a piece of air and gets his tongue inside some girl's pussy. After every fight, be prepared for a lot of ecchi. The mangaka never runs out of justifications for his ecchi scenes. After the first couple of volumes, all female characters that get introduced will be nude after a chapter or two. And the ecchi in this is heavy. See chapter 97.005 to get a sense of how heavy the ecchi is. It is a bonus chapter so do not worry about getting spoiled about anything. As wild as the ecchi in this chapter may be, it is still mild compared to many other scenes in the manga. If the ecchi still doesn't convince you to read the manga, then I am sure that the story will do the job.

I will now discuss the two arcs that I mentioned earlier ar the start. Needless to say, this will contain some spoilers. But before that, let us revisit some substantial information:

tsugumomo-an object that, after having existed for a long time, obtains a soul. They live off of the mysterious power of their human owners.

Kagami Kazuya-the main character. An 8th grade student of Kamioka Middle School.

Kiriha-an obi tsugumomo. She is Kazuya's partner. She was given to Kazuya by his mother, who is now deceased.

Kukuri-the goddess of the land of Kamioka. She apparently has a seal on Kazuya's memories. She also seems to have a barrier surrounding Kamioka. Currently in a weakened state, she is staying in the Kagami household, together with her divine servant, Kokuyou.

Sunao Sumeragi-the exorcist of a neighboring area of Kamioka. She is the owner of the katana tsukumogami Kotetsu.

Very minor spoilers ahead

Mayoiga arc

Mayoiga("Lost Village")-a place where tsugumomo who have lost trust in their owners come to stay

A thousand years ago, a group of ownerless tsugumomo asked the gods for salvation, but this was denied. The gods left them to run out of the mysterious power and die. Of course, they would not accept this.

A stone shard is an object that holds an enormous amount of mysterious power. All stone shards are held by the gods of lands, with one god having one shard each.

Due to having an immense amount of power, stone shards cause disaster when near other stone shards.

The group of tsugumomo, led by Miurahi, plotted to kill a god of the land and take his stone shard. After succeeding, Miurahi, a house tsugumomo, put the shard inside himself. Inside Miurahi's house form, tsugumomo get their mysterious power replenished. This is Mayoiga.

Back to the present. Recently, the stone shard inside Miurahi began to run out of mysterious power. They plot to kill another god of the land and steal his stone shard. Using the power of Arumi, a crystal ball tsugumomo, they look ahead into the future in order to gather information. In the vision, they see a mysterious black object. Not knowing what this meant, they go to the location of this object and capture it. They take it back to Mayoiga. After a while, the object reveals itself to be a tsukumogami, nicknamed Azami. She informs the Mayoiga group that she will help them if they follow her instructions.

This will be continued after I make a 2-sentence synopsis of the next arc.

Minor spoilers ahead

(Turning point of the whole story) arc

Someone "dies." Someone gets killed.

The continuation of the Mayoiga arc is below. The continuation of this arc will be below it.

WARNING

Spoilers ahead

Since Kukuri is already at a weak state, she becomes the target of the Mayoiga tsugumomo.

Due to the weakening of the shard's power, a bunch of Mayoiga tsugumomo have already been depleted of their mysterious power and died. Due to this, a small group from Mayoiga got impatient and secretly decided to go kill Kukuri themselves. They all get defeated. Kukuri also shows how badass she is.

After recruiting a hundred strong tsugumomo, Miurahi decides that it's time to go to Kamioka and kill Kukuri.

Such a large movement does not go unnoticed. After the initial attack, Kukuri already knew what was going to happen. At her shrine, she waited, together with the local metal god, the local weather god, Kazuya, Kiriha, Sunao, Kotetsu, and Kokuyou.

The Mayoiga group finally arrives. On a one-on-one fight between Kukuri and Miurahi, Kukuri(in her loli form) gets forced to temporarily undo the barrier surrounding Kamioka. She reverts back to her true form. The preparations for a massive battle are done.

The conclusion of this arc is intertwined with the start of the next arc so I will also reveal it in the next part. This is a major spoiler, so beware.

MAJOR WARNING

MAJOR spoilers ahead

After Kukuri reverts to her true form, the Mayoiga group gets defeated without Kukuri having to do anything, literally.

Remember Azami? It was actually revealed earlier that she is a black obi. It was also revealed that apart from the Azami in Mayoiga, there was also an Azami in Kamioka.

Kukuri's barrier was apparently supposed to keep the first Azami from getting into Kamioka. Now that it's gone, she is able to go inside Kamioka. The two meet and together, ripped a hole through Miurahi's chest and took his stone shard. They use its power in order to reanimate Kanaka's body, which was kept by the first Azami.

After being betrayed, the Mayoiga group turns to and goes for Kanaka and Azami. Kanaka, being the overpowered hag that she is, literally defeats them single-handedly, with her right arm, to be specific.

Kanaka, wishing for a worthy opponent, urges Kukuri to undo Kazuya's seal so that she can fight him in his full power. Kukuri refuses and decides to fight her instead. After fighting Ascended Sunao and heavily wounding the two local gods, Kanaka is left with only Kukuri as her opponent.

Even after using her ultimate form, Kukuri gets killed by Kanaka.

Kanaka then goes for Kazuya, who has been shocked still for a while now.

Even after using Ascension, Kazuya still can't beat Kanaka. Kiriha sacrifices her life to protect Kazuya from Kanaka's drills. After seeing Kiriha's pierced body turn into shredded bits of cloth, Kazuya is at a loss.

Kasumi comes to the rescue. She reveals that she is actually the owner of an hourglass tsugumomo. She tells Kazuya that she will buy him 3 years and that he should use that time to train in order to beat their god-killer mother. Using her technique, Moment Enshrined, Kasumi stops time for her, her tsugumomo, and Kanaka.

Have questions(how could you not?)? Go read the manga. Kanaka's backstory is revealed later in the manga. Azami's backstory is revealed afterwards.

As of May 2017, the manga has not (yet) explicitly stated that Kiriha is dead. Although it does lead the reader to believe that she is indeed dead. Kukuri is confirmed to be dead though.