The official Hana Awase twitter announced that the March issue of B's LOG (releasing on 1/19) will be featuring multiple short stories on various characters. For example there will be one for Ai, Shou, Aoi, the chairmen, and many more. There will also be a new illustration and episode for Mizuchi-hen and messages from Iroha, Mizuchi, Himeutsugi, and Karakurenai to Mikoto.
A vocal CD is planning to be released on 2/27 featuring the 5 Brights and there will be two versions.
- The normal version, for 2500 yen, includes the main theme song of Hana Awase (featuring all 5 men) and 5 character songs.
- The limited edition (from Animate), for 3000 yen, includes the main theme song, 5 character songs, and 5 off-vocals of those character songs.
There is also a Drama CD planned for release in February featuring 3 episodes with Mizuchi after his happy end. These three tracks will involve the dummy head mic and they will set up three different situations. One of the situations will be about the two of you alone in his room, one will be about his thoughts as he sees you talking to Himeutsugi, and the last will be about you becoming insecure with his distance and his reaction to that.
Two DJCDs have also been released already. I believe they are a radio show hosted by Terashima Takuma about Hana Awase, but it mainly features them talking to each other about various things. The seiyuu are not in character during this.
You can order these various CDs here at Hana Awase's marine website.