After Rias has decided to let Asia live with Issei, Bang looked on what is going on by the streets of Japan. He saw it looks fine.

"The city of Japan; the city of culture, peace, and prosperity... But it's a breeding ground for evil! I should watch myself!"

Just then...

"Hey, old man, shut the fuck up!" a voice exclaimed.

"How dare you call me an old man?! Identify yourself!" Bang exclaimed and he turns around to see Issei, Matsuda, and Motahama.

"My name is Issei," Issei introduced himself, then introduces his friends. "This is Matsuda and Motahama, and we're the Perverted Trio!"

"Is that so? My name is Bang Shishigami, the ninja who fights in the name of love and justice. You three look at girl's breasts?"

"We sure do!" Matsuda and Motohama exclaimed together.

"Well, in that case, I want in it!" Bang exclaimed happily. "Tell me, are there any girls with breasts that are as big as Miss Litchi's?"

"Miss Litchi?" Matsuda is confused.

"Who's that?" Motahama looks confused as well.

If I'm not mistaken, Bang is from the timeline where Ragna lives... Issei thinks through the ninja.

"Now, where are those girls?" Bang asked.

The trio takes him to a dojo where they notice Murayama and Katase are preparing to change from their casual outfits to their kendo outfits. Bang happens to watch this moment by the rooftop from above the trio.

"Look at their breasts. Just as big as Miss Litchi's. If only she's here in this time as well..." he commented.

"Hey, a scruffy old man is peeking on us!" Katase pointed at him.

"Hey, I'm not that old!" Bang exclaimed before she throws a pan at him which causes him to fall to Issei, Matsuda, and Motohama.

Just then, the four are facing the wrath of the two girls and the other kendo girls with their sticks.

"Well, well, this is new," Murayama said with disdain on seeing Bang as well. "So are you now a quartet?"

"It's not what it look like!" Bang exclaimed with nervousness.

"You perverts!" Katase screamed as she, Murayama, and the others beat not only Issei, Matsuda, and Motohama, but also Bang for looking at their naked bodies while dressing up.

After this...

"This is just too much. Little girls attacking us with sticks..." Bang muttered while in pain.

"Yup, it's too extreme," Issei muttered as well.

"At least we got to see some nip!" Motohama exclaimed happily.

"This city has some hilarious moments as well, especially for me, Bang Shishigami!" Bang exclaimed before attempting to leave the trio. "You kids have fun! Let me know if you're going to have this kind of activity again!"

"Awesome! What a great ninja!" Matsuda exclaimed happily.