Taking place 75 years after the first series, Steel Angel Kurumi 2 brings the Steel Angels in a new mis-adventure. High school student and aspiring cellist Nako Kagura accidentally discovers and kisses Kurumi Mk. II at her home, thus making her Kurumi's master. But things go awry as Nako's best friend Uruka gets jealous and tries anything - including her father's army of top-secret mecha - to destroy Kurumi and win back Nako. Things get more out of control when Saki Mk. II is awakened by Uruka, and Karinka Mk. II joins in to steal Nako away from Kurumi. (Source: ANN)

The scene is Steam City, a London-ish city which represents an entire civilization run by coal and steam power. Because of steam, the city is sometimes covered in a mist. Villains take advantage of the steamy mist to hide and execute their evil plans. Only a few dare venture into what's beyond the steamy mist. They are known as the Steam Detectives: Narutaki (and his convertible all-purpose pistol), his nurse-assistant Lingling, and his Megamaton robot Gohliki. (Source: ANN)

Hikaru Hoshina is an energetic middle school student with a love for space and the occult. As she draws constellations in her notebook, a small and fluffy creature suddenly appears from it! The creature, which she names Fuwa, turns out to be an alien with the ability to create warp holes. When Fuwa's companions, the aliens Lala Hagoromo and Prunce, arrive on Earth, they declare that they are searching for the Precure, legendary warriors who will save the universe. But an organization known as the Notraiders soon follows and attacks, intending to capture Fuwa and its power. Overcome by a desire to protect Fuwa, Hikaru finds herself transforming into Cure Star, one of the Precure that Lala and the others have been searching for! It is now up to Hikaru and the rest to fend off the Notraiders' onslaught, discover the rest of the Precure, and find the Star Color Pens, artifacts that will awaken the 12 Star Princess who keep the universe in balance.

Following a successful graduation performance, Yuuta Hoshitani and the rest of the second years begin preparations for the upcoming Ayanagi Festival. This year's festival is the first time the students will be without their Kao Council mentors, giving them the creative freedom to do what they want. Hoping to perform alongside each other for once, the second years decide to put on a joint production together. The festival’s opening ceremony will also serve another purpose—to reveal next year's Kao Council candidates. The Kao Council announces that Team Hiiragi was selected for the opening ceremony performance, preventing them from participating in the collaboration. This shocks and enrages Hoshitani and the others, driving a rift between them and the Kao Council. In an effort to realize their dreams, the students begin to hatch a plan to ensure that all of the second years can perform together on stage.