O-uchi-gari into Tate-shiho-gatame.

Transition (Tachi-waza into ne-waza).

Techniques
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1. O-uchi-gari (大内刈), the major inner reap.
2. Tate-shiho-gatame (縦四方固), the vertical four-quarter hold.

About
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The inner reap puts your partner flat on their back with you already between their legs, which is the one throw that leads straight into the lengthwise hold.

Step by step (standard right-handed form)
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1. Take your right grips and reap the inside of their left leg with your right leg.
2. Keep the sleeve as they fall so their head is supported.
3. Follow them down, riding forward so your hips land astride their waist.
4. Bring your knees up tight against their sides and hook your feet around the outside of their legs if you can.
5. Slide one arm under their head and trap one of their arms against your chest.
6. Keep your chest low and your weight settled; release the moment they tap.

Receiving it
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The reap puts you flat on your back with them already between your legs, so take the fall properly and then move at once: chin tucked, slap with your free arm, and start turning onto your side before their hips settle astride your waist. Once their knees are tight to your ribs and an arm is trapped, the hold is very hard to shift. Trap a leg early or make space with your hips while there is still space to make.

Demonstrations
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British Judo: O-Uchi-Gari into Tate-Shiho-Gatame https://www.youtube.com/watch?v=hRyKboeJY9Y
Destination Judo: O-Uchi-Gari into Tate-Shiho-Gatame https://vimeo.com/535080190

VI judo notes
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This is the one throw that puts you straight into the lengthwise hold, so the follow-through is worth drilling as part of the throw rather than as a separate skill. Keep the sleeve as they fall and ride forward with them, letting your hips land where your hands say their waist is. Once astride, read their bridging through your knees and chest rather than reaching to find it.

From Waza Book: https://wazabook.com/transitions/o-uchi-gari-into-tate-shiho-gatame.txt