Onideka! - Vol. 4 Ch. 18 - I Sent a Line... But it's still Unread.

[MangaDex]

 

[TOPPUSUPIDO1998]

*Pacific Rim Theme starts playing*

 

[BakedBanana]

On page 45 Kiryuin Hanao is dressed up as Puchiko from Di Gi Charat. She's even holding Gema with the GAMERS text behind her (GAMERS being the store Puchiko works at alongside Dejiko and Usada).