This is an after story of Kira Kira. It has two parts: First and Second Stage First stage concentrates on hotblooded young guy named Souta Honda. He loved two things in this world: rock and his childhood friend Yui Hoshimoto. But attempts to improve relations with both always turned out a total disgrace for him. After one more fail he promised Yui that he'll form his own band and became "bright like the sun" to make her love him... Second stage is, in a way, a continuation both for Souta's story and original Kira Kira story. It tells about preparations for the large concert celebrating the 5th anniversary of Murakami's group, Happy Cycle Mania and bonds all old and new characters together.

A collaboration fandisk celebrating the 5th anniversary of OVERDRIVE, featuring a crossover between Kira☆Kira and DEARDROPS. Riho watches Kirari and Shouichi’s overseas performance on TV and sees that Shouichi is enjoying it more than before. She wonders if she would be able to beat Kirari. At that moment, she never thought that she would have a chance to do just that. [From Micchi's [url=http://omochikaeri.wordpress.com/2011/11/01/november-2011-eroge-releases/]blog[/url]]

Shouichi was known as one of the ‘nobles’ of the violin world. Having started playing the violin when he was 3, he won the national violin competition when he was in middle school and went to Germany to play in orchestras. However, due to unknown reasons, he returned to Japan, gave up playing the violin and became a freeter. One day, he starts working at a live house and meets many other amateur musicians who are living their lives their own way. Together they will have to overcome obstacles in both their personal lives and as a band. To Shouichi, the live house is a new beginning in a new place… a new world which has opened to him when he thought that his future as a musician had closed. [From [url=https://omochikaeri.wordpress.com/2010/04/02/april-2010-eroge-releases/]Hau~ Omochikaeri![/url]]

Overdrive's final project. Kei used to attend a famous high school with aspirations of one day becoming a doctor like his parents, but he stopped for a term due to certain reasons and is now studying part-time. While his journey had become more difficult, it was still possible to get back on track. However, after meeting many different types of people that he had not previously encountered and realizing that there was so much in the world that he did not know, he began to question what future he truly desired. After receiving a prize from a city-wide competition for a short story that he wrote, he was asked by Yagihara, the president of a music production, to accompany their band on their upcoming tour and write a report about the event. The band was Kachoufuugetsu, which once performed on the big stage. Its leader Korekiyo is quite a peculiar fellow and talked at length about how music was pointless and good for nothing. Even though Kei was perplexed about Korekiyo, he was taken away by the band’s music when he heard it for the first time. A few days later after that memorable first live, Kei found out that they were disbanding. Unable to accept the sudden news, he approached Korekiyo many times to convince him to change his mind, but no argument could sway him. Instead, Korekiyo asked him: “How about you play rock in my place?” [From [url=https://omochikaeri.wordpress.com/2019/12/24/december-2019-eroge-releases/]Hau~ Omochikaeri~![/url]]