Back in the 00's, during the Tsundere Era of Anime, when harem was popular but only let the first girl/guy win and abandon all other girls/guys, there was a certain story routine that went something like this: X is usually an unreliable loser, and when Y needs X, X is usually screwing around and/or late, and only when Y dies tragically does X suddenly Musou Mode, Berserk Form, wreck everyone