It's like a trend that they seem to do. Like when Connect came out then Nexus their first album Birthday came out months later. Than Second Story came out the year later, with both respective albums releasing in the summer time.
Oh well, at least they're more prominent in the anime music seem so that's good, right?
Oh yes! The new ClariS single "Step" is out way earlier than expected. If you're watching Nisekoi, following ClariS, or both; it's out now. So go out and have a listen if you have time. Because you know I will!