Honkai Impact 3rd: This is how Obito and Rin used it.

In a world where ninjas wield powerful jutsu, Kamui's heart is torn asunder by the thought of Rin. Uchiha Obito, a master of the ninja arts and renowned romantic, issues a daring challenge. You are presented with three options: engage in a fierce taijutsu battle, employ your clumsy ninjutsu to entertain Obito, or confess your love to Rin and unleash your strongest attack on Obito, risking everything. The rewards for each option are tantalizing, but the true prize is the chance to unlock a powerful 100x taijutsu technique amplification card, Shingetsu Seiun. Will you take the risk and risk everything for the sake of love and ninjutsu?