Nino said he likes the lyrics of Radwimps’ Yuushinron, where it goes like this:

• 君があまりにも綺麗に泣くから
• 僕は思わず横で笑ったよ
• すろと君もつられて笑うから
• 僕は嬉しくて泣　く泣く

-

• You cry so beautifully,
• that, by your side, without realising it, I smiled
• And that made you smile too,
• which has made me so happy I’m crying, crying

(The lyrics really described Nino a lot. According to fan report, when Aiba cried during Kouhaku, Nino cried too. Also, in Shukudai-kun, when Aiba told story about him being hospitalised, Nino was seen wiping his eyes while covering with his bang.)