Zenitsu X Inosuke Novels & Stories

She instantly closed her eye. With her right hand, she tried to clean the blood. A soldier tried to use the advantage. With his long sword, he rushed in. Mariko swiftly moved back, slipping on the blood. She fell. The soldier was above her with his sword held high. He stopped, tried to scream. There was no use. Inch by inch, the bloody tip of a sword appeared from his mouth. He fell to the ground. Mariko looked up. Inosuke stood above her, covered in blood from head to toe.

if I can recall his name is Seisaju he's one of the forth Strongest Kiyosaku. Seisaju : Well Shinjuku we're here. Shinjuku : Yessss Now let the games begin. S1 E10 "Life or Death"