Kore Kara da! / Ashita Tenki ni Naare (これからだ！/明日テンキになあれ; It Starts From Now! / Tomorrow Will Be a Beautiful Day) is Kobushi Factory's 5th single. It was released on March 28, 2018 in 5 editions: 2 regular and 3 limited. The first press of the regular editions included a random trading card of 6 kinds depending on the jacket (12 in total). Limited Edition SP included an event lottery serial number card.
On April 16, 2018, the start the "Kore Kara da! Ashita wo Tenki ni" Ouen Project (「これからだ！明日をテンキに」応援プロジェクト; "It Starts From Now! For Beautiful Weather Tomorrow" Support Project) to celebrate the single's release was announced and a special site was opened.
A present campaign limited to Japan will be open until May 6, 2018:
Fans must follow the official Kobushi Factory Twitter account @kobushifac_uf.
Tweet what they thought of the story in the campaign videos posted on the site with the hashtag "#こぶし綺羅星テンキになあれ" (Kobushi Kiraboshi Tenki ni Naare; Kobushi Glittering Stars Will Have Beautiful Weather).
Staff will then select 20 people to win a "Ashita e Habatake! Kiraboshi" (明日へ羽ばたけ！綺羅星; Flying Towards Tomorrow! Glittering Stars) keychain.
The "Ashita Tenki ni Naare" music video features the group on the set of a fictional western talk show called Kobushi Show with Kobushi Factory, whose title card and window backdrop of a landmark bridge (which in this case is the Rainbow Bridge in Tokyo, instead of the Manhattan Bridge in New York City) are based on the Late Show with David Letterman. The uncredited host mentions "There's been a lot of depressing news lately, but tonight's guests are guaranteed to blast those blues away!" which is likely a reference to the group making a strong comeback after losing three members in 2017.
Kurt KC Common, who narrates the English weather report during the song break of "Ashita Tenki ni Naare", is a radio personality, a narrator for NHK WORLD, and an English announcer for Tokyo Disneyland.
The "Kore Kara da!" music video was filmed at Tachikawa Sozosha, a former elementary school in Tachikawa, Tokyo. Similarly, the Greeting ~Fujii Rio・Ogawa Rena~ DVD was also filmed at this location.