Idk wats going on..But something depressing is going on..
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Essentually it's just blackhair going over what he could've done to make brownhair understand that his love was genuine and how he regrets how things happened.
How he regrets not doing things to help brownhair in the past. This isn't included in the chapter and it's just a little theory but I think he was trying to get revenge on greenhair not for his sake. But for brownhairs for all the things greenhair put him through, why is why greenhair is mentioned alot throughout the chapter.
Sorry, it's hard for me to remember names so I just used their haircolour.
Hahaha kind of funny..BUt arigatou~~~(づ￣ ³￣)づ
[SPOILER]
Regret