Recaps

Senba Gari and Takai Geki fought Hastur with help from Cirno, μ's, and the Kamen Riders before the Knight Hunter's campaign left the world collapsing after Kamen Rider Number One was erased. The story then returned to Senba Gari's past and recounted how he inherited Divine's power and defeated Lion Mlortha.

• Senba Gari witnessed his friends' deaths and admitted killing several companions before waking at home and finding everyone gathered for his birthday.
• Senba Gari and Takai Geki investigated new monsters after five peaceful years, and Senba Gari discovered villages devastated by Hastur.
• Cirno trained Takai Geki in elemental control, and Takai Geki rescued her from Ithaqua inside her mind with Wizard's help.
• Hastur attacked μ's concert, but μ's and the crowd encouraged the Kamen Riders to defeat him before Zero erased him in a rift.
• The Knight Hunter hunted the Riders and overwhelmed Divine, Spirit, and Chievil before Kadoya Tsukasa intervened and rescued the fallen Riders.
• Senba Gari awoke in a conquered world, remembered his companions' sacrifices, and learned that erasing Kamen Rider Number One had caused the world to disappear.
• Senba Gari's earlier expedition with Senba Ryo uncovered an ancient Stone Belt, and Senba Gari later found his father and their teammates dead.
• Gaia saved Senba Gari after he protected Arisa from Lion Mlortha, and Camus entrusted him with Divine's power before he defeated the monster.

Senba Gari became Kamen Rider Divine, fought several Mlortha, and began teaching at Otonokizaka as the school faced closure. Honoka, Umi, and Kotori started preparing for a school-idol live show while the HBRUTES plotted to free their creator.

• Senba Gari met Minami Kotori and the Otonokizaka girls, became Kamen Rider Divine, and gained Silver Phantom as his partner.
• Divine defeated Black Cat Mlortha and gained Fenrir’s power, then fought Hagoromo Gitsune and survived the collapse of a department store while rescuing trapped people.
• Senba Gari accepted a teaching job at Otonokizaka, where he learned the school might close and began teaching Honoka Kosaka, Sonoda Umi, and Minami Kotori.
• Divine fought an eagle Mlortha but Muramasa defeated him and escaped with the monster, while Honoka decided to form a school-idol group after seeing A-ries perform.
• Honoka, Umi, and Kotori began preparing for a live show, won permission to use the auditorium, and asked Senba Gari to advise them.
• The girls struggled to find a practice space, choose a group name, and write a song, so Umi agreed to write lyrics and set a practice schedule.
• Hodnig gathered the HBRUTES, learned that a human was being used to test the Seed of Original Sin, and declared they would free their creator.

Honoka Kosaka and her friends formed μ's, overcame their first performance jitters, and gradually welcomed Hanayo Koizumi, Rin Hoshizora, Maki Nishikino, and Yazawa Nico. As Senba Gari grew into Divine and joined forces with other Riders to defeat the ant Mlortha queen, μ's began preparing to practice without a single leader or center.

• Senba Gari helped Honoka Kosaka, Minami Kotori, and Umi Sonoda train, while Honoka named their school idol group μ's and asked Maki Nishikino to compose for them.
• Senba Gari survived Great Shocker's attack, received a mysterious ring, and helped the girls practice as Honoka, Umi, and Kotori prepared their first live.
• Umi overcame her fear of handing out flyers and performing, and μ's performed “START:DASH!!” to an almost empty auditorium before Honoka declared she wanted to keep singing.
• Senba Gari confronted his fear of failure, transformed into Divine Unicorn, and defeated Mlortha, while Hanayo Koizumi began considering her own dream of becoming an idol.
• Hanayo joined μ's, and Rin Hoshizora and Maki Nishikino were invited to join as well, bringing the group to six members.
• Yazawa Nico resisted μ's efforts to recruit her, but the members welcomed her as their club president, and she eventually joined and led their rooftop practice.
• Senba Gari and Silver Phantom fought the ant Mlortha queen with help from Takai Geki and the other Kamen Riders, and Divine defeated the queen before Senba and Geki opened the ancient stone boxes.
• After learning that Divine and Spirit were needed to destroy Yamata no Orochi, Honoka proposed that μ's perform without a fixed leader or center, and Nico accepted the plan as the members began practicing.

μ's grew into a nine-member group, saved Otonokizaka from imminent closure, and created a song for an Akihabara performance while Senba Gari faced new supernatural threats. The arc ended with Maki Nishikino saying she might quit μ's and Honoka going to ask her why.

• μ's decided to apply for LoveLive, and Kotori Minami approved their participation on the condition that every member pass her finals.
• Senba Gari and Takai Geki investigated Mlortha and rescued Wako Hirota, whose father’s final letter and Pochi’s sacrifice helped him accept their bond.
• Eli Ayase joined μ's after Nozomi Tojo and Honoka Kosaka helped her admit that she wanted to become an idol.
• μ's performed at Otonokizaka’s open day, and Honoka learned that the school would postpone its closure after the survey results.
• Senba Gari investigated the dangerous food at Taste of Food while Kotori Minami told her friends about her work as maid Minalinsky.
• Kotori found inspiration in Akihabara, and μ's performed in maid outfits there after Senba defeated Boar Mlortha and protected the girls.
• Senba’s colored crystals began fusing as Maki Nishikino argued with her father, told μ's she might quit, and ran away crying.
• Honoka and the others went to the Nishikino residence, where Honoka rang the doorbell to ask Maki for an explanation.