Tsukiuta. The Animation

Six Gravity (Gravi) and Procellarum (Procella), two idol units currently experiencing a dramatic rise in fame. On the day of Gravi and Procella’s handshake event, each of the members are waiting for the start of the event, doing as they individually please. During that time, Shiwasu Kakeru, Kisaragi Koi, and Minaduki Rui meet Syunpei, a primary school student. Syunpei is taking the place of his sister, a fan of Kakeru’s, who had unfortunately come down with a cold. Although Syunpei does not know anything about these idols……

Kannaduki Iku, while being an member of the unit Procellarum, is also a member of his high school's track-and-field club. That same Iku has been selected as the representative athlete for the track-and-field meet he has always aimed to participate in. Iku, who works hard to balance both his idol career and his track-and-field career. The same Iku who all the members of Procellarum, including their leader Shimotsuki Shun, watch over warmly and cheer on. But it looks like balancing both his training for the meet and his busy idol work is proving to be quite difficult for him……

Six Gravity, as part of the promotion for their new single, have become store clerks at the "Animate Store Ikebukuro Main Branch" for a day. Rather than Six Gravity's leader Mutsuki Hajime being today's manager, fellow Senior Group-member Yayoi Haru has been assigned. Haru, who been quite engrossed in his laptop, preparing for this day, has come up with a idea specifically for their project...... Will they be able to pull the event without any problems......? It's finally Gravi's turn to be in Animate!

Uduki Arata and Haduki You, and Satsuki Aoi and Nagatsuki Yoru, were all double-casted at the same stage play. However, the skilled and successful actor Mikaduki Yuzuru, who is in the same play, refuses to acknowledge idols, who's line of specialty isn't acting. He especially critical of Arata, who works at his own pace. Aoi, who teaches Arata and at the same time devotes himself with his own rehearsals, suddenly becomes ill one day.

One day close to Tanabata, the members of Procellarum are at one of Japan's scariest haunted houses at an amusement park for filming for a television program. On the day of filming, Fuduki Kai, one of the members of Procellarum, had a certain dream. It was a dream that was filled with memories of Tanabata――. As soon as filming began, Kai, who was paired up with Rui, saw something and disappeared, chasing after that something.

For the shooting of a promotional video, Gravi and Procella are at a resort island! From enjoying marine sports to a beach volleyball showdown, both groups are having their fill of the island and summer! With the shooting going as planned, all that's left now is free time... when a tragic crime has occurred! Without so much as a single lead on who committed the crime, Koi, claiming the title "the Great Detective Koikku", has set out to solve this crime! Will Koikku discover the one and only truth!?