Daitan Futeki ni Koi Shitai

Readyyy! is Sega's male idol training smartphone game. Within it is a 4-unit group called Just 4U. This is their official music video for their Daitan Futeki ni Koi Shitai song. Just 4U is the second unit that received a short MV but the fourth unit to receive a full MV. (Source: Readyyy Project Wikia)