This video shows how the case 別件依頼:いわく付きの家 (File 1, Case 10) is done. The annontations are included in this video, I don't want to explain it over here. So once the chicken is up, he has a weakness to Lightning so either Zio/Maha Zio/Zioradi (on Auto-Repeat) or Raidendan/Raidenken ready. This huge poultry has a very high Attack stat, he deals insane damage especially his Shoudokugeki (瘴毒撃) which can render a demon OHKO or sometimes casts Petra, which obviously, causes Stone then his breath skill Zettai Reido (絶対零度) which deals Ice damage so have those Dia skills or recovery items handy! After the battle, the chicken will send out two treasures stones, red and blue. Choose the first option then pick a treasure of your choice. The treasure you chose depends on what side you're currently on (Chaos, Law or Neutral) so you might get different items/money. With that, it's case complete and thus clearing File 1! Raidou - Level 26
If you accept the 別件依頼: 走り屋の亡霊 (File 1, Case 8), go to Ikai Tsukudou-cho via Nameless Shrine and go to the northmost of the city and you'll encounter Uwasa no Oboroguruma (Optional Boss). He's weak to Wind so Zan/Zanradi on Auto-Repeat and Shippuken will work like a charm here. Be warned though, you only have 3 minutes to defeat him so get strong to take him down real fast. His Maha Zio is a pain too so evade or defend then attack him with his weakness to interrupt it. His Tosshin attack causes Stun leaving your demons or yourself vulnerable to his Maha Zio. With this, the case is complete! Raidou - Level 25
You won't beat this guy at first after beating Jiroumaru so stay away from him and survive. Here, I was able to do Renkenjutsu which enhances Raidou's sword (Renkitou to Himezuru Ichimonji) attack power and change weapon type (from Sword, Spear or Axe) as well but with the required materials (which a specific demon type drops) and a hefty amount of cash. In this video, the Strong Attack button unleashes a flurry of thrusts which causes knockback. Mashing it works well for more damage. I used Gurenken by Agacion (did some combinations) and mashly spammed the Triangle Button happily while Agacion spams Maharagi and Angel spams Agi (both on Auto-Repeat). The moment his HP goes 1/4, he'll start using "Kane Arare" (not seen in the video) which causes Stun but the last hit summons a HUGE gold coin which may be impossible to evade BUT there will be a shaded square so quickly position yourself and your demons (press L2) so that you'll be safe. With this, Chapter 1 is finished. Raidou - Level 14
If you accept the 別件依頼:べとべとさんの恐怖 (File 2, Case 9) go to Kasumidai (since you won't access it UNLESS you take up this case!) and head to the northeastern part of the city. Just like Makami, you'll face 15 of them and they're quite tough since their Combo skill deals much more damage and has a resistant to Physical attacks, you might resort to using spells and items. They weak against Wind and Curse so Zan/Maha Zan (recommended)/Zanradi (Auto-Repeat), Shippuudan/Shippuuken or Gehouken (If Lilim is in your party) is a must here but if you want a fast fight, Shippuu Chuugitotsu (疾風忠義突) and problem solved. With that, it's case complete! You'll be rewarded with Sanjyuuni-nen Shiki Guntou (三十二年式軍刀), an axe-type weapon. Raidou - Level 26 (I didn't have time grinding)
These two guys called their pet instead of fighting face to face...cowards! This guy is freaking big but he's suspectible to Fire attacks so neither Agi/Maharagi Auto-Repeat or Gurenken works well here. He does decent damage especially his Hopper Kick which he jumps high, which is a sign to stop attacking and start healing up the party before he pulls it off. If you lop his HP down half, he'll run away thus ending the battle. Raidou - Level 12