Actually, I can say Japanese ( being happening to be native Japanese well, ) did not use the crossbows almost at all throughout its entire history except for shortly before 10th century. ( I am sorry this is Japanese and Wiki site )
According to the above source, along with the increase of Samurai's gradual role throughout Japan ( up until, say, at least 6-7 century, even the northern part of Japan was not ruled by the central dynasty. ), the crossbows became not to be used by them due to the difficulties of the maintenance of them as well as the management, whereas long bows are comprably light and easy to maintain, so that after 10th century, it looks the crossbows completely disappeared. We can guess such a consequence by considering the size of Japan, I think. ( almost equal to California and Japan is a mountain-full country. )
So while crossbows were used widespreadly used in China, which is enormously large, on the other hand, Japan is tiny and there are many hills and mountains so that I or we can guess the Samurais preferred much lighter weapons than heavy ones such as crossbows.
By the way, I am wondering the phrase in your question.
What is teppo yumi? Teppo means rifles, whereas yumi is a long ( or rather shorter ) bow. So that personally I guess the writer should have inserted a comma as Teppo, Umi ( Rifles, Bows ( We called the crossbows "DO".))
And regarding Oyumi ( I have no idea what that means ), since Mitsutomo Tokugawa lived in peacuful era ( the final battle ended in 1615 ), so that it may be possible he invented or imported from China the crossbow.
I like reading books about the warring era in Japan too, but I have neer ever
heard even there was a battalion or an unit comprised only of the crossbowers for 30 years. ( Although there were many units comprised only of bow users before the rifles were imported and widespread. )
Per the request by Courtny Cotten at the comment line, I would like to show you 4 pictures of wars during war era.
Nagashino War : Nobunaga Oda vs Takeda family, 1575.
Can you see any crossbowmen groups? No, only what I can see are Spearmen, Rifle units, Horsemen group. ( Please note after the import of Teppo, bowmen became less and less important. ( But you can find one bowman at around down left and 2 bowmen at around the center ( between rifle groups ( Kindly check with due attention )))
2. Sekigahara War : Ieyasu Tokugawa vs Toyotomi subordinates AD1600
Same. Can you find anyone?
Kindly refer to the below 2 so that you can see clearly from earlier dates Samurais used bows as their main weapon ( before Teppo came ):
3 Ounin War Many warlords vs many worlords.
You can find bowmen but not crossbowmen.
4 Paited late 13th century, about his ( as a symbol of the Samurai's ( actually drawn by himself ) great play defending Japan from Chinese ( Mongolian ) Invasion 1274 or 1281
Thank you. Please have good days.