Tsuyoshi Ichinose

Tsuyoshi Ichinose (一ノ瀬 剛, Ichinose Tsuyoshi) is a momotaro and Shiki's adoptive father. He adopted him when he was still a baby.

Appearance
Tsuyoshi is an old man with various wrinkles. He has a beard and spiky, dark hair.

Plot
Tsuyoshi was a former member of the Momotaro clan but one day, he adopted Shiki Ichinose who happen to have an Oni blood. Because of this taboo that he committed, he became a wanted man that the Momotaro Corp chases. And since then, they have been hiding in order to prevent the Momotaro to kill both of them.

In the present time, Tsuyoshi is an owner of a store that sells alcohol. In Chapter 1, he appeared with an angry face and punched Shiki after knowing that he got expelled from his school. After that, they started to tease each other up until someone calls on the phone asking for a beer delivery. Tsuyoshi drove and while he was away, a mysterious man suddenly appeared right in front of their house. Shiki tried to look who was it but a sudden explosion occurred that made the mysterious man to be blown inside the house. At the same time, Tsuyoshi smashed the mysterious man with the car he was driving. He then told Shiki to get in the car and started to drive away. Shiki tried to ask who was that person and Tsuyoshi explained that it was someone from the Momotarou Corp who's mission is to kill someone that carries an Oni blood. He also revealed that Shiki is have an Oni blood and it's here to do its job. The Momotaro guy caught up with them and the car crashed in a construction site.

Shiki was tied by the Momotaro guy's ability and while he was being held captive, the Momotaro guy which is Momoya Samidare and Tsuyoshi talked for a bit. In their conversation, it was revealed that Tsuyoshi was a former member of the Momotaro Corp. And since he adopted a child with an Oni blood, it was seen as a betrayal to the clan and he was tasked to kill the both of them. Tsuyoshi didn't let it happen and the both of them started to battle using their ability.

In their battle, Samidare had the upper hand and managed to damaged Tsuyoshi that's enough for him not to be able to stand up. While he was down on the ground, Samidare started to walk towards Shiki to kill him but Tsuyoshi stopped him by grabbing one of his legs. With this, Samidare asked Tsuyoshi why he wanted to protect an Oni child for which he responded that it's because he is his son. While the both of them are busy with each other, Shiki started to go berserk. Because of this, he was able to save his father from getting killed. But, when he went back to normal, Samidare tried to finish him off but Tsuyoshi shielded him which made Tsuyoshi's situation even worse.

Samidare started to back out as the chopper comes down to his location. As soon as he got away, Tsuyoshi was already in a very critical situation due to the damage he received. And while laying down, he apologized to Shiki for hiding his true identity and told him to get stronger so that he will never lose to neither the Momotaro and Oni clan. After this, Shiki tried to carry his body and told him it's not the end for the both of them yet, but before they could even move another step, Tsuyoshi already reached his limit and passed away.

When Shiki got caught by another Oni person named Mudano Naito, it was revealed that they are keeping his body in the mortuary.

Power & Abilities
He is a momotaro, which allows him to use black bacteria to create weapons of choice.