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Artist's commentary
Tawawa on Monday #249 "Concentration"
"Concentration" as in the pair-matching card game. The literal meaning "nervous breakdown" also applies to Onii-san's reaction in the last panel.
Ｋ♥
This is a reference to King of Heart from Mobile Suit G Gundam.
Source: https://twitter.com/Strangestone/status/1198775181503655936
This hand of mine is burning red!
Source: https://twitter.com/Strangestone/status/1198775484521172992
(Its loud roar tells me to) grasp victory! (Abbreviating the lengthy spiel.)
Source: https://twitter.com/Strangestone/status/1198775815099437059
This week's theme is "King of Heart".
Source: https://twitter.com/Strangestone/status/1198798460608225280