u/Ken_Sanne

I'm not talking about Masashi, I'm talking about Seichi, his twin brother.

I remember discovering that masashi has a twin brother and he's a mangaka too and finding that so cool, I've read that masashi's fans found his artstyle and even narrative style so similar to masashi's that he was accused of plagiarizing masashi's work, masashi had to step in and tell his fans to cool down because they grew up reading and drawing the same thing so of course their work is similar.
I did try to read his work though, I didn't like Satan 666 very much but gosh did I love Blazer Drive, the art is cool, and I liked the plot and mc. For those of you who didn't know about this guy and his work, here are the wikipedia summaries :

Blazer Drive :
Taking place in a futuristic style of Tokyo, Japan. Society has harnessed the power of the elements into items known as "Mystickers" which give off various effects depending on which is used and can be applied to everyday housework or even combat. Daichi is a young teen that resents his older brother but finds comfort in his dealings with friends. After an encounter with some bullies Daichi discovers he has the potential to become a Blazer, people who are able to apply these "Mystickers" unto their skin without causing harm to their own bodies. It isn't after another deadly encounter with an unknown assailant of an organization that's targeting him that Daichi learns of his fate and that of his brother. At the cost of something precious, Daichi sets out to reclaim that which was taken, embarking on a dangerous quest with a new resolve and a powerful "Mysticker" of his own.

Satan 666 :
O-Parts (オーパーツ, Ō Pātsu), named after out-of-place artifacts (OOPArts), are ancient relics found throughout the world, left by an extinct civilization from before mankind existed.^([3]) They are primarily used as weapons or forms of transportation, but many are tools for tasks such as cooking. The people who are able to use O-Parts are known as O.P.T.s (オプト, Oputo; O-Part Tacticians), who are able to release their Spirit (スピリッツ, Supirittsu) and focus it into the O-Part, which it then absorbs and uses as energy to activate a special Effect (エフェクト, Efekuto), usually of a fantastic nature.^([3]) There are some cases when the Effect of a single O-Part varies for each person who uses it, due to their Spirits being different.^([4]) O-Parts are appraised and given a ranking out of seven, from E to SS, based on its effect, difficulty to use, and power. O-Parts ranked A or above are extremely powerful and are supposed to be handed over to the government.^([5])

Throughout the world, there are ten Angels (天使, Tenshi) and ten Demons (悪魔, Akuma) with amazing powers that are sealed within humans. They are being searched for by the Stea Government (Angels) and the Zenom Syndicate (Demons) who want to insert them within the Kabbalah (正カバラ, Sei Kabara; lit. "Positive Kabbalah") and the Reverse Kabbalah (逆（リバース）カバラ, Gyaku (Ribāsu) Kabara), that are found on the North and South Pole respectively. A legend tells that when either Kabbalah is filled, a super weapon called the Legendary O-Part (伝説のオーパーツ, Densetsu no Ō Pātsu) will be awoken. As such, Angels and Demons are often referred to as Recipes (レシピ, Reshipi).

Set in the near future, it tells the story of a teenage girl named Ruby Crescent who wants to become a treasure hunter, following in the footsteps of her father. Her objective is to find O-Parts: magical items hidden in ruins which grant people fantastical powers and can only be used by an O.P.T. (O-Part Tactician). She soon meets a mysterious boy named Jio Freed who, due to having a dark, lonely past, seeks to conquer the world. Jio is hostile to her at first but ends up traveling with Ruby as her bodyguard. When Ruby is attacked by an O.P.T., who claims to be Satan, Jio rushes to her rescue and a battle occurs. Initially they are on the losing side, but Jio releases his true power and is revealed to be not only an O.P.T., but the real Satan. Thus, the two continue to travel together in hopes of achieving their dreams.