Post looks too spamy for a new user. Lmfao.
Anyways.
I can't throw a recipe away. Please help.

It's the Oninodachi one you get from Chief Daruma.
I can't discard it and I received two somehow.

Perhaps you could try converting it into points daruma. That's what I did when I couldn't get rid of my youkai ticket.

You received two? That sounds like a glitch. There's a couple like that going around actually. A few of my characters have the four jewels from Yamataikoku stuck in their inventory, as well as Teahouse Manjuu. The items don't take up space, as far as I can tell, but they can't be stored, sold, pointed, discarded or anything else at all. CyberStep will probably address this glitch sometime in the next 50 years. Maybe. If we're lucky.

Even so, I tried to convert it but since its a quest item, it doesn't appear on the convert / exchange list.
Mine is taking up one slot though so...I also sent an email with the attachment to them of the screenshot.
Don't know how well the customer support responds for this gaming community so we'll have a looksie.
Sort of a glitch, there was dialogue from Chief Daruma saying I had misplaced my oninodachi recipe due to clumsiness, so he gave me another.
That's how I got two. I have the learned recipe in the Weapon Smithing list and the extra recipe taking up one slot in the storage.