Eijiro Kirishima, a full-time firefighter, has struggled with an enormous secret guilt his entire life. The only problem? He has amnesia, and can't remember what he's feeling guilty about. His solution has always been to keep moving forward and save those around him, so how will he manage when he's the one who needs saving? After meeting a stubborn and hot-headed paramedic, Eijiro realises that the only way to process his traumatic past is to deal with it head on - and Katsuki knows a lot about dealing with things head on. The only issue is the mystery of why Katsuki is the only one able to bring back Eijiro's lost memories...

While out for a late night stroll bakugou comes across a broken boy. He befriends him giving him a place to call home and someone to look out for him. The two become inseparable.