(Kamen Rider Cross-Z OC X Crossover Harem)

A young boy named Hiro Shizuki dreamed of being a boxer, but found out that his father was framed for a crime he didn't commit. Once he started training, he is found by Ryuga Banjo, who reveals who framed his father and why. He also gave him the Build Driver, The Cross-Z Dragon, the Magma Knuckle and the Cross-Z fullbottles so he can fight the villains and defeat the one who framed his father.

Main Character: Hiro Shizuki/Kamen Rider Cross-Z

Harem:

Tomo Aizawa

Weiss Schnee

Mordred Pendragon

Artoria Pendragon

Artoria Alter

Rin Tohsaka

Misuzu Gondou

Carol Olston

Momo Belia Deviluke

Lala Satalin Deviluke

Nana Astar Deviluke

Komi Shouko

Nao Tomori

Mysterious Heroine X

Mysterious Heroine X Alter

Mikan Yuuki

Yami

Stella Vermillion

Haruna Sairenji

Itsuka Kendo

Pyrrha Nikos

Yui Kotegawa

Winter Schnee

Chloe Von Einzbern

Morgan Le Fay

Origami Tobiichi

Ichika Nakano

Nino Nakano

Miku Nakano

Yotsuba Nanako

Itsuki Nakano

Allies:

Maverick Hunters

Ruby Rose

Blake Belladonna

Yang Xiao Long

Class 1-B

Ratatoskr

Shiro Emiya

Ikki Kurogane

Jaune Arc

Nora Valkyrie

Lie Ren

Rito Yuuki

Futaro Uesugi

Ryuga Banjo (Former Cross-Z)

Ace Operatives

General Ironwood

Penny Polendina

CIel Soleil

Enemies:

Gabriel Agreste/Monarch (the one who framed Hiro's father)

Felix Fathom/Kamen Rider Rogue

Salem's Inner Circle

Deus Ex Machina

Team CRDL

Repliforce

Sigma