Honkai Mask Starting from the Wind Capital

... This is not the mirror world that is opposite to reality, this is a collapsed Fudu Mask——! Luo Nian, who traveled to W, rescued Wakana with Sonosaki Saeko...! On the starting night, in order to save her sister Wakana, Sonosaki Saeko was attacked by Philip and Shotaro, and paid the price with her life. At that time, Wakana asked Luo Nian: Can you be my law of victory? In the shining light, Luo Nian and Wakana became one, transforming into masks to protect Fengdu! Has a bi-colored body! The head has two tentacles! This is - Kamen Rider Build! Their opponent is the enemy cadre who was also transformed by the two of them - the two-color weirdo W! The Honkai Mask that started on the night when the Wind City started... Begins here! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.