Tanaka-kun wa Itsumo Kedaruge - Vol. 7 Ch. 68

[MangaDex]

 

[DeProgrammer]

There practically are holidays every day. http://www.apples4theteacher.com/holidays/

 

[Machrischt]

I'd have Tanaka Day any day

 

[softhaneul]

planning some useless but genius-worthy stuffs like these are peak friendship