One day has passed since Tsuna and his friends had returned to the past and they still have yet to receive a trial. Reborn says he doesn't know what order the Arcobaleno will appear. Tsuna suggests they should go to school and do as they would usually do. However, during recess they are suddenly attacked on the roof! It is a baby with goggles. It’s Lal Mirch. Lal says that she is the observer to the Arcobaleno Trials. Their first opponent is Colonnello, who has a blue pacifier. Colonnello begins Tsuna and Gokudera's trial to test their combat abilities--!
Tsuna et Gokudera sont confrontés au premier test Arcobaleno : le test d'habileté au combat contre Colonello. Le même jour, deux étranges jumeaux font leur entrée dans la classe de Tsuna…
Mentre Tsuna e gli altri sono a scuola vengono attaccati da Lal Mirch, che gli spiega di essere l'osservatore delle prove e che la prima sarà tenuta da Colonnello.
回到原本世界的隔天早上,阿纲等人一如往常前往学校上课。班上刚好在今天来了两名转学生,而且他们放学之后就拉着京子与小春一起逛街。另一方面,阿纲正式开始接受阿尔柯巴雷诺的考验,至于第一项考验,就是可乐尼洛所进行的战斗能力测验。
En esta prueba se reúnen todos los guardianes y comienza la prueba de colonello.
10年前に戻ってから、試練がないまま1日が過ぎてしまった。リボーンは、アルコバレーノがいつどの順番で現れるか分からないという。ひとまず学校に行き、通常通りに過ごしているよう言われるツナだったが、休み時間の屋上でいきなりの襲撃を受ける!相手はゴーグルをした赤ん坊。その正体は――10年前のラル・ミルチだ。ラルはアルコバレーノの試練の立会人だという。最初の試練の相手は、青いおしゃぶりを持つコロネロだ。コロネロによる、ツナと獄寺の「戦闘力」の試練が開始される……!