Tanaka-kun wa Itsumo Kedaruge - Vol. 3 Ch. 21

[MangaDex]

 

[dedotikea]

Machocolate...

 

[BakedBanana]

"...I don't have a phone. I've never heard of a delinquent girl using a smartphone.." (Page 5)

What kind of delinquent doesn't have a phone?
checks date of when this came out
Ah, 2013? Okay, that makes a little more sense..