The group was formed in phases:
On December 2015, six different configurations were offered to be chosen from.
On January 2016, the unit compositions were revealed, and people were asked to submit names for them.
On March 2016, the choices for unit names were revealed.
On April 2016, the chosen unit names were revealed. Guilty Kiss' name was meant to symbolize the slightly grown-up and little devil-like image the unit has.
Their group introduction goes: 「愛こそ全て、Guilty Kiss」"Ai koso subete, Guilty Kiss", which translates to "Love is everything, Guilty Kiss".
All of Aqours' songs and albums can be found here.
Guilty Kiss' first single is "Strawberry Trapper."
Unit C: The artistic trio with strong individualities. Riko x Yoshiko x Mari (Western Gothic Type)
Sakurauchi Riko: Being placed together with these two strong personalities, I will do my best too!
My first unit's fellow members are Yohane-chan and Mari-chan--- When I first heard that, I was a little bit excited♡ After all, you see, no matter how you look at it, these two are totally different from Riko, they're so individualistic and brilliant... But, well, just being with these two extremely fun people is interesting. Looks like I will be able to work hard from here onwards♡
Tsushima Yoshiko: We'll attack all-out with our feminine charms!♪
Out of the nine of us, I think our unit has assembled the cute, devilish and lady-like members♡ Yes, from here onwards, I'll draw Mari and Riko-chan onto the fallen path, and dye our unit in the dark color of little devils~♪ You have no choice but to look forward to our unit of cute bewitching devils, alright?
Ohara Mari: We'll have everyone's gazes glued onto us♡
Unit activities with just three people--- have three times the responsibilities as compared to usual♪ Alright! If it's come to this, then no matter whether it's three times, four times, five times or even ten times more, we'll do it! We'll have everyone's eyes glued onto us with our sparkling performance~♡ Did you know? I'm the type that gets more hyped the more people anticipate us♡ Please look forward to us♪
No matter how you look at it, for Guilty Kiss to be filled with this black and dark devilish charm, Yohane is the main character for this♪ If you don't support us, you'll fall into hell~♡♡
With us being different from how Aqours usually is, please enjoy this slightly cool and awesome Mari♪ I'll capture your gaze entirely!
Being pulled along by Mari-chan and Yohane-chan's momentum--- I've discovered a different self. Though it's a bit embarrassing, please take a look at us♡
Other polls also determined the names of the sub-units: CYaRon!, AZALEA, and Guilty Kiss.
Due to the image presented by the members, many of the name submissions had a dark or gothic feel to them. Other highlighted submissions are "RYM," and "Chrom Cross."
The sub-unit's voice actresses all have "Ai" in their names. This is the origin of their unit introduction "Ai Koso Subete" or "Love is Everything" in the 7th episode of It's A Trio! One, Two, Sunshine!!.
Guilty Kiss is the only Aqours sub-unit to have one member from each year.