Deletion of Arigatō (manga)

Comment: per : Special:Diff/976884638|I just added two sources, which don't quite rise to the level of sustained coverage. A merge to Naoki Yamamoto (manga artist) is also possible. Unfortunately, :ja:ありがとう (漫画), while much longer, doesn't seem to help much with sourcing
Stance: keep
Cited policy: Wikipedia:Notability (WP:NBOOK)