マイ（山下美月）と久しぶりの再会を果たした健人（萩原利久）。自分の気持ちを伝える健人を前に、マイは突然苦しみだす。
二人の様子を見ていた教師・松井（岡田義徳）は、健人の前に姿を現し、マイが健人を覚えていたことに激怒。そして、もめる健人と松井は屋上から落下してしまう…。その日を境に、由那（武田玲奈）の家にかくまってもらうマイ。ビデオデッキのカウンターは刻々と過ぎ、再生時間は残り3日となっていた…。
Kento (Hagiwara Riku) reunites with Mai (Yamashita Mizuki) after a long time. Mai suddenly begins to feel distressed when Kento confesses his feelings to her. Matsui (Okada Yoshinori), a teacher who had been watching the two of them, appears before Kento and is furious that Mai remembered him. Kento and Matsui then fall off the roof after arguing... From that day on, Mai is taken in by Yuna (Takeda Rena) at her house. The counter on the video deck is ticking away, with only three days left to play...
