Arc 4Akihabara and New Bonds
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.