Ongekigen

Ongekigen (音撃弦): Guitar-Oni's Ongeki Weapon are the Ongekigen. Taking the Ongekigen "blade attacking mode" along with the Ongekishin, forms the Ongekigen's "guitar mode". Plugging the end of the Ongekigen into the Makamou, Onis utilize Sound of Purification by playing their guitar, the pure sound waves destroy the Makamou.

Todoroki
Ongekigen - Retsurai (音撃弦・烈雷): Todoroki's Ongeki Weapon is the Ongekigen Retsurai. Taking the Retsurai's "blade attacking mode" along with the Ongekishin Raigou, forms the Retsurai's "guitar mode". Plugging the end of the Retsurai into the Makamou, Todoroki utilizes Sound of Purification by playing his guitar, the pure sound waves destroy the Makamou. At first, it has yellow chords (when it is owned by Zanki). Then, it is given to Todoroki and has red chords. There is a red Oni's face on it.

Zanki
Ongeki Shingen - Retsuzan (音撃真弦・烈斬): Zanki's Ongeki Weapon is the Ongeki Shingen Retsuzan. Attaching the Ongekishin Zantetsu onto the Retsuzan while in its "blade attacking mode" forms the Retsuzan's "guitar mode". Plugging the end of the Retsuzan into the Makamou, Zanki utilizes Sound of Purification by playing into his guitar. Zanki's Retsurai and Raigō were given to Todoroki when he retired. It has yellow chords and a yellow Oni's face.

Sabaki
Ongekigen - Enma (音撃弦・閻魔): Sabaki's Ongeki Weapon is the Ongekigen Enma. Taking the Enma's "blade attacking mode" along with the Ongekishin Gokuraku, forms the Enma's "guitar mode". Plugging the end of the Enma into the Makamou, Sabaki utilizes Sound of Purification by playing his guitar, the pure sound waves destroy the Makamou. It has yellow chords and a red Oni's face.

Kogata no Ongekigen (小型の音撃弦) A pair of small version of guitars Ongeki weapon.