Clockwork Lullaby Series

Are you searching for the song called Clockwork Lullaby?

Clockwork Lullaby (ぜんまい仕掛けの子守唄 Zenmai-Jikake no Komoriuta) is a series of songs made by Akuno-P. It is a collection of 6 songs. ぜんまい仕掛け(Clockwork) is also often translated as "Spring-worked".

Background
A series of six songs done by Mothy that at the first seemed to have no major relationship than the distinctive "lu li la" pattern sung on all the songs. Those ones are: The matter that if there were a connection between "Daughter of Evil" series and "Zenmai-Jikake no Komoriuta" series was hotly-debated among fans until the debut of the songs Heartbeat Clocktower. Lately the song "Chrono Story" revealed that actually this songs series are part of the complex network that conforms the Mothy's storyline. Despite this, the link between the song is a kinda ambiguous and Akuno-P mentioned the interpretation can differ to person to person.
 * 1) The zeroth song (technically the first) is "Wordplay (Kotoba Asobi)" sung by Kagamine Rin
 * 2) The first song is "Clockwork Lullaby (Zenmai-Jikake no Komoriuta)" sung by Kagamine Rin.
 * 3) The second song is "Miniature Garden Girl (Hakoniwa no Shoujo)" sung by Hatsune Miku.
 * 4) The third song is "Re birthday" which is sung by Kagamine Len.
 * 5) The fourth song is "Heartbeat Clocktower" which is sung by KAITO.
 * 6) The fifth song is "Chrono Story" which is sung by Kagamine Rin/Len and Megurine Luka.
 * 7) The sixth (and probably the last) song is "Capriccio Farce (Chaban Kapurishio)" sung by all of the VOCALOIDs that acted in "Seven Deadly Sins Series".

Like in all Akuno-P's works, the songs have keywords associated to them.

The story so far...
With the world coming together as the United States of Evillious, Elluka Clockworker, under the pseudonym "MA", and Gallerian Marlon, the "Collector", have gathered six Vessels of the Sins:

The Venom Sword, the Glass of Conchita, the Four Mirrors of Lucifenia, the Clockworker's Doll, Kayo's Scissors, and the Marlon Spoon. The last Deadly Sin, Wrath, has still yet to be found.

To safeguard the collected Vessels, MA and Gallerian constructed a theater in the middle of Eldoh's Forest in Elphegort. Following the events of Judgement of Corruption, the gathered vessels have begun to awaken, manifesting in human bodies and adopting the personalities of their former owners. With their newfound power, the Awakened Sin Vessels transformed the forest into a cursed land. This is the twilight of Evillious. The end starts now.